Created Interface to be able to customize PropertyGrid

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/PropertyGrid/PropertyGrid.cs

@@ -35,7 +35,20 @@ using System.Windows;
 
 namespace ICSharpCode.WpfDesign.Designer.PropertyGrid
 {
-	public class PropertyGrid : INotifyPropertyChanged
+	public interface IPropertyGrid
+	{
+		IEnumerable<DesignItem> SelectedItems { get; set; }
+		Dictionary<MemberDescriptor, PropertyNode> NodeFromDescriptor { get; }
+		DesignItem SingleItem { get; }
+		string Name { get; set; }
+		string OldName { get; }
+		bool IsNameCorrect { get; set; }
+		bool ReloadActive { get; }
+		event EventHandler AggregatePropertiesUpdated;
+		event PropertyChangedEventHandler PropertyChanged;
+	}
+	
+	public class PropertyGrid : INotifyPropertyChanged, IPropertyGrid
 	{
 		public PropertyGrid()
 		{
@@ -54,7 +67,8 @@ namespace ICSharpCode.WpfDesign.Designer.PropertyGrid
 		Category attachedCategory = new Category("Attached");
 
 		Dictionary<MemberDescriptor, PropertyNode> nodeFromDescriptor = new Dictionary<MemberDescriptor, PropertyNode>();
-
+		public Dictionary<MemberDescriptor, PropertyNode> NodeFromDescriptor { get { return nodeFromDescriptor; } }
+		public event EventHandler AggregatePropertiesUpdated;
 		public CategoriesCollection Categories { get; private set; }
 		public PropertyNodeCollection Events { get; private set; }
 
@@ -220,6 +234,8 @@ namespace ICSharpCode.WpfDesign.Designer.PropertyGrid
 				}
 			} finally {
 				reloadActive = false;
+				if (AggregatePropertiesUpdated != null)
+					AggregatePropertiesUpdated(this, EventArgs.Empty);
 			}
 		}
 

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/PropertyGrid/PropertyGridView.cs

@@ -43,9 +43,13 @@ namespace ICSharpCode.WpfDesign.Designer.PropertyGrid
 		}
 		
 		
-		public PropertyGridView()
+		public PropertyGridView() : this(null)
 		{
-			PropertyGrid = new PropertyGrid();
+		}
+		
+		public PropertyGridView(IPropertyGrid pg)
+		{
+			PropertyGrid = pg??new PropertyGrid();
 			DataContext = PropertyGrid;
 		}
 		
@@ -61,7 +65,7 @@ namespace ICSharpCode.WpfDesign.Designer.PropertyGrid
 
 		static PropertyContextMenu propertyContextMenu = new PropertyContextMenu();
 
-		public PropertyGrid PropertyGrid { get; private set; }
+		public IPropertyGrid PropertyGrid { get; private set; }
 
 		public static readonly DependencyProperty FirstColumnWidthProperty =
 			DependencyProperty.Register("FirstColumnWidth", typeof(double), typeof(PropertyGridView),