adds OnContextChanged method

src/AXSharp.blazor/src/AXSharp.Presentation.Blazor.Controls/RenderableContent/RenderableComplexComponentBase.cs

@@ -29,8 +29,27 @@ public T Component
             get => _component;
             set
             {
-                _component = value;
+                if (_component == null)
+                {
+                    _component = value;
+                    this.OnComponentChanged();
+                    return;
+                }
+
+                if (_component != null && !_component.Equals(value))
+                {
+                    _component = value;
+                    this.OnComponentChanged();
+                }
             } 
         }
+
+        /// <summary>
+        /// Method called when the component (the context component of this rcc) is changed.
+        /// </summary>
+        public virtual void OnComponentChanged()
+        {
+
+        }
     }
 }

src/AXSharp.blazor/src/AXSharp.Presentation.Blazor.Controls/RenderableContent/RenderableContentControl.razor.cs

@@ -52,11 +52,20 @@ public ITwinElement Context
                 if (_context != value)
                 {
                     _context = value as ITwinElement;
+                    this.OnContextChanged();
                     this.ForceRender();
                 }
             }
         }
 
+        /// <summary>
+        /// Method called when the context is changed.
+        /// </summary>
+        public virtual void OnContextChanged()
+        {
+
+        }
+
         /// <summary>
         /// Parameter Presentation specify mode, in which view UI is generated. Type PresentationType is used.
         /// </summary>
@@ -69,11 +78,16 @@ public string Presentation
                 if (_presentation != value)
                 {
                     _presentation = value;
+                    OnPresentationChanged();
                     this.ForceRender();
                 }
             }
         }
 
+        public virtual void OnPresentationChanged()
+        {
+
+        }
 
         /// <summary>
         /// Parameter Class, in which RenderableContentenControl will be wrapped.