The IsDragPreviewEnabled and IsDragTooltipEnabled properties don't work with the "NEW" DragDropExecutionMode.

When you have a, for example, a RadSlider in a RadTreeViewItem and you try to move the Thumb of the slider, the drag events of the tree view item will be triggered. The same behavior is observed also when you have a TextBox instead of a slider and try to mark part of the text in it with the mouse.

The DefaultImageSrc property doesn't show the image when it is set to a relative file path.
Reason for Decline: This is not actually a bug. When you set the DefaultImgSrc in XAML starting with "/" the Image is shown successfully. In WPF the relative image sources must begin with "/".

http://msdn.microsoft.com/en-us/library/aa970069%28v=vs.110%29.aspx 

RadTreeView is throwing an IndexOutOfRangeException when the host panel is resized. 
StackTrace:
 at Telerik.Windows.Controls.TreeView.IndexTree.CumulativeValue(Int32 endIndex) in c:\TB\105\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\TreeView\Virtualization\IndexTree.cs:line 271
   at Telerik.Windows.Controls.TreeView.TreeViewPanel.ExtendDesiredSize(ItemsControl itemsControl, Size stackDesiredSize, Int32 pivotIndex, Boolean before) in c:\TB\105\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\TreeView\Virtualization\TreeViewPanel.cs:line 2287
   at Telerik.Windows.Controls.TreeView.TreeViewPanel.MeasureOverride(Size constraint) in c:\TB\105\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\TreeView\Virtualization\TreeViewPanel.cs:line 1680

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This item is declined because we are unable to reproduce such exception with our latest binaries.

Sometimes when using the treeview in TriStateMode I wish I could have the ability to uncheck all the children of an indeterminate parent with one click. Currently when a parent is in indeterminate mode and you click on it, it will activate it and all it's 
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Reason for Decline:
This is a custom requriement and could be implemented as application logic based on this example:
http://www.telerik.com/help/wpf/radtreeview-howto-tri-state-mvvm.html

When the IsLineEnabled property is set to True and there are more than 3 levels of hierarchy, the lines look jagged.