Removed sealed constraint from class declaration to allow inheritance.
Performs casting of extended component only once in OnInitialized, and casts to only necessary level (i.e. FrameworkElement) to allow inherited classes to support other panels that maps to Canvas placement properties (using DependencyProperty.AddOwner).
XamlParser now supports attached property used on a derived class.
Added null-check of ParentTree, as this have been null and caused exception.
Rotate Thumb -> Update Adorner on Rotation
Extension Server for Only one Selected Item
TopLeftContainerDragHandle for all Framework Elements
In WPF Designer A few extensions should only be used when only One Item is Selected,
because they only work with one Item (ResizeThumb, RotateThumb, RenderTransform, QuickOperationMenu)
Adorner Display fix
(fixes #435)
Snapline for middle of Object (like in VisualStudio)
Make Snapplines also work for Items in other Containers
RotateThumb -> Only when Only one Item is selected
Add "package get" project for SDR
Merge pull request #444 from gumme/WpfDesignerStabilityBugFixes

Added null-check to avoid exception
Merge pull request #443 from gumme/WpfDesignerCanvasPlacement

Minor changes to allow inheritance from CanvasPlacementSupport
Merge pull request #442 from gumme/WpfDesignerParserFixes

XamlParser now supports attached property used on a derived class.
Skew Thumb Extension
Remove unused Code from Rote Thumb
Merge remote-tracking branch 'remotes/sd/master'
Fix UNDO on Resize and Skew Extension
New Selection Extensions Server (PrimarySelectionButOnlyWhenMultipleSelectedExtensionServer) & fix OnlyOneItemSelectedExtensionServer