Custom dialog background and foreground

[void22]

What steps will reproduce this issue?

I'm using custom dialog as a message box (with Background="Transparent" and Foreground=White) like in the picture:

It works well with version 1.1.2, but since 1.2.0 (including the latest 1.3.0-ALPHA147) both Background and Foreground colors are "ignored".

The result is:

Expected outcome

What I already tried:

• Set colors in xaml
• Set colors via bindings from VM
• Set colors before dialog shown
  var dialog = new TestDialog(); dialog.Background = new SolidColorBrush(Colors.Red);
• Create new style
• Add custom resource to dialog.DialogSettings.CustomResourceDictionary

None of them is working. I'm sorry if this question was already answered, but I did not find a solution neither on SO nor here.

Environment

• MahApps.Metro v1.2.0
• Windows 10 x64
• Visual Studio 2015
• .NET Framework 4.6

[void22]

It seems the problem is in BaseMetroDialog.Initialize().

If I change the Loaded delegate from
this.Loaded += (sender, args) => { OnLoaded(); HandleTheme(); };

to
HandleTheme();
this.Loaded += (sender, args) => { OnLoaded(); };

everything is working as expected.

The loaded event triggers properly and HandleTheme() runs as it should so I don't know why this happens.