Add new Win10 Slider style

src/MahApps.Metro.Samples/MahApps.Metro.Demo/MahApps.Metro.Demo.Shared/ExampleViews/SliderProgressExamples.xaml

@@ -12,9 +12,6 @@
 
     <UserControl.Resources>
         <ResourceDictionary>
-            <ResourceDictionary.MergedDictionaries>
-                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/FlatSlider.xaml" />
-            </ResourceDictionary.MergedDictionaries>
             <BooleanToVisibilityConverter x:Key="BoolToVisibilityConverter" />
         </ResourceDictionary>
     </UserControl.Resources>

src/MahApps.Metro/MahApps.Metro.Shared/Controls/RangeSlider.cs

@@ -19,15 +19,13 @@ namespace MahApps.Metro.Controls
     /// A slider control with the ability to select a range between two values.
     /// </summary>
     [DefaultEvent("RangeSelectionChanged"),
-     TemplatePart(Name = "PART_Container", Type = typeof(StackPanel)),
+     TemplatePart(Name = "PART_Container", Type = typeof(FrameworkElement)),
      TemplatePart(Name = "PART_RangeSliderContainer", Type = typeof(StackPanel)),
      TemplatePart(Name = "PART_LeftEdge", Type = typeof(RepeatButton)),
-     TemplatePart(Name = "PART_RightEdge", Type = typeof(RepeatButton)),
      TemplatePart(Name = "PART_LeftThumb", Type = typeof(Thumb)),
      TemplatePart(Name = "PART_MiddleThumb", Type = typeof(Thumb)),
-     TemplatePart(Name = "PART_PART_TopTick", Type = typeof(TickBar)),
-     TemplatePart(Name = "PART_PART_BottomTick", Type = typeof(TickBar)),
-     TemplatePart(Name = "PART_RightThumb", Type = typeof(Thumb))]
+     TemplatePart(Name = "PART_RightThumb", Type = typeof(Thumb)),
+     TemplatePart(Name = "PART_RightEdge", Type = typeof(RepeatButton))]
     public class RangeSlider : RangeBase
     {
         #region Routed UI commands
@@ -392,7 +390,7 @@ public Double MinRange
         private RepeatButton _leftButton;
         private RepeatButton _rightButton;
         private StackPanel _visualElementsContainer;
-        private StackPanel _container;
+        private FrameworkElement _container;
         private Double _movableWidth;
         private readonly DispatcherTimer _timer;
 
@@ -885,44 +883,61 @@ private void OnRangeSelectionChanged(RangeSelectionChangedEventArgs e)
         public override void OnApplyTemplate()
         {
             base.OnApplyTemplate();
-            _container = EnforceInstance<StackPanel>("PART_Container");
-            _visualElementsContainer = EnforceInstance<StackPanel>("PART_RangeSliderContainer");
-            _centerThumb = EnforceInstance<Thumb>("PART_MiddleThumb");
-            _leftButton = EnforceInstance<RepeatButton>("PART_LeftEdge");
-            _rightButton = EnforceInstance<RepeatButton>("PART_RightEdge");
-            _leftThumb = EnforceInstance<Thumb>("PART_LeftThumb");
-            _rightThumb = EnforceInstance<Thumb>("PART_RightThumb");
+
+            _container = GetTemplateChild("PART_Container") as FrameworkElement;
+            _visualElementsContainer = GetTemplateChild("PART_RangeSliderContainer") as StackPanel;
+            _centerThumb = GetTemplateChild("PART_MiddleThumb") as Thumb;
+            _leftButton = GetTemplateChild("PART_LeftEdge") as RepeatButton;
+            _rightButton = GetTemplateChild("PART_RightEdge") as RepeatButton;
+            _leftThumb = GetTemplateChild("PART_LeftThumb") as Thumb;
+            _rightThumb = GetTemplateChild("PART_RightThumb") as Thumb;
+
             InitializeVisualElementsContainer();
             ReCalculateSize();
         }
 
-        //Get element from name. If it exist then element instance return, if not, new will be created
-        private T EnforceInstance<T>(string partName) where T : FrameworkElement, new()
-        {
-            var element = GetTemplateChild(partName) as T ?? new T();
-            return element;
-        }
-
         //adds visual element to the container
         private void InitializeVisualElementsContainer()
         {
-            _leftThumb.DragCompleted += LeftThumbDragComplete;
-            _rightThumb.DragCompleted += RightThumbDragComplete;
-            _leftThumb.DragStarted += LeftThumbDragStart;
-            _rightThumb.DragStarted += RightThumbDragStart;
-            _centerThumb.DragStarted += CenterThumbDragStarted;
-            _centerThumb.DragCompleted += CenterThumbDragCompleted;
-
-            //handle the drag delta events
-            _centerThumb.DragDelta += CenterThumbDragDelta;
-            _leftThumb.DragDelta += LeftThumbDragDelta;
-            _rightThumb.DragDelta += RightThumbDragDelta;
-
-            _visualElementsContainer.PreviewMouseDown += VisualElementsContainerPreviewMouseDown;
-            _visualElementsContainer.PreviewMouseUp += VisualElementsContainerPreviewMouseUp;
-            _visualElementsContainer.MouseLeave += VisualElementsContainerMouseLeave;
-
-            _visualElementsContainer.MouseDown += VisualElementsContainerMouseDown;
+            if (_visualElementsContainer != null
+                && _leftThumb != null
+                && _rightThumb != null
+                && _centerThumb != null)
+            {
+                _leftThumb.DragCompleted -= LeftThumbDragComplete;
+                _rightThumb.DragCompleted -= RightThumbDragComplete;
+                _leftThumb.DragStarted -= LeftThumbDragStart;
+                _rightThumb.DragStarted -= RightThumbDragStart;
+                _centerThumb.DragStarted -= CenterThumbDragStarted;
+                _centerThumb.DragCompleted -= CenterThumbDragCompleted;
+
+                //handle the drag delta events
+                _centerThumb.DragDelta -= CenterThumbDragDelta;
+                _leftThumb.DragDelta -= LeftThumbDragDelta;
+                _rightThumb.DragDelta -= RightThumbDragDelta;
+
+                _visualElementsContainer.PreviewMouseDown -= VisualElementsContainerPreviewMouseDown;
+                _visualElementsContainer.PreviewMouseUp -= VisualElementsContainerPreviewMouseUp;
+                _visualElementsContainer.MouseLeave -= VisualElementsContainerMouseLeave;
+                _visualElementsContainer.MouseDown -= VisualElementsContainerMouseDown;
+
+                _leftThumb.DragCompleted += LeftThumbDragComplete;
+                _rightThumb.DragCompleted += RightThumbDragComplete;
+                _leftThumb.DragStarted += LeftThumbDragStart;
+                _rightThumb.DragStarted += RightThumbDragStart;
+                _centerThumb.DragStarted += CenterThumbDragStarted;
+                _centerThumb.DragCompleted += CenterThumbDragCompleted;
+
+                //handle the drag delta events
+                _centerThumb.DragDelta += CenterThumbDragDelta;
+                _leftThumb.DragDelta += LeftThumbDragDelta;
+                _rightThumb.DragDelta += RightThumbDragDelta;
+
+                _visualElementsContainer.PreviewMouseDown += VisualElementsContainerPreviewMouseDown;
+                _visualElementsContainer.PreviewMouseUp += VisualElementsContainerPreviewMouseUp;
+                _visualElementsContainer.MouseLeave += VisualElementsContainerMouseLeave;
+                _visualElementsContainer.MouseDown += VisualElementsContainerMouseDown;
+            }
         }
 
         //Handler for preview mouse button down for the whole StackPanel container

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Amber.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/BaseDark.xaml

@@ -89,6 +89,7 @@
     <Color x:Key="MenuShadowColor">#FFFFFFFF</Color>
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.DisabledHighlightBrush" Color="{StaticResource Gray7}" options:Freeze="True" />
 
     <SolidColorBrush x:Key="MahApps.Metro.Brushes.ToggleSwitchButton.PressedBrush.Win10" Color="#FF999999" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/BaseLight.xaml

@@ -89,6 +89,7 @@
     <Color x:Key="MenuShadowColor">#FF000000</Color>
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.DisabledHighlightBrush" Color="{StaticResource Gray7}" options:Freeze="True" />
 
     <SolidColorBrush x:Key="MahApps.Metro.Brushes.ToggleSwitchButton.PressedBrush.Win10" Color="#FF666666" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Blue.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Brown.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Cobalt.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Crimson.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Cyan.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Emerald.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Green.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Indigo.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Lime.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Magenta.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Mauve.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Olive.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Orange.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Pink.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Purple.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Red.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Sienna.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Steel.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Taupe.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Teal.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />

src/MahApps.Metro/MahApps.Metro/Styles/Accents/Violet.xaml

@@ -40,6 +40,7 @@
     <SolidColorBrush x:Key="AccentSelectedColorBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
 
     <!--  DataGrid brushes  -->
+
     <SolidColorBrush x:Key="MetroDataGrid.HighlightBrush" Color="{StaticResource AccentColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.HighlightTextBrush" Color="{StaticResource IdealForegroundColor}" options:Freeze="True" />
     <SolidColorBrush x:Key="MetroDataGrid.MouseOverHighlightBrush" Color="{StaticResource AccentColor3}" options:Freeze="True" />