Revert "interface for PropertyGrid.cs"

This reverts commit 5bdc1ac.

Author: tbulle

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

@@ -35,20 +35,7 @@
 
 namespace ICSharpCode.WpfDesign.Designer.PropertyGrid
 {
-	
-	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 class PropertyGrid : INotifyPropertyChanged
 	{
 		public PropertyGrid()
 		{

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

@@ -46,7 +46,7 @@ public PropertyGridView() : this(null)
 		{
 		}
 
-		public PropertyGridView(IPropertyGrid pg)
+		public PropertyGridView(PropertyGrid pg)
 		{
 			PropertyGrid = pg??new PropertyGrid();
 			DataContext = PropertyGrid;
@@ -64,7 +64,7 @@ public override void OnApplyTemplate()
 
 		static PropertyContextMenu propertyContextMenu = new PropertyContextMenu();
 
-		public IPropertyGrid PropertyGrid { get; private set; }
+		public PropertyGrid PropertyGrid { get; private set; }
 
 		public static readonly DependencyProperty FirstColumnWidthProperty =
 			DependencyProperty.Register("FirstColumnWidth", typeof(double), typeof(PropertyGridView),