Currently we are aware of two cases in which the edit mode is not working correctly:
1. The first case is when tree view item is put into edit mode and before the edit mode is completed another item is also put in edit mode. This case is generally achieved through code and calling the BeginEdit method. Usually the BeginEdit is called on a click of button placed inside the TreeViewItem template. This bug is already fixed and should not be occurring with the upcoming 2011 Q2 SP release dlls.
2. The second issue is generally described as: "Edit mode does not starts when fast clicks are performed over tree items". Actually this issue is cause by the drag and drop manager and its functionality. We are still investigating the cause and will try fix it as soon as possible. However, a workaround by setting the IsDragDropEnabled property to true could be used for the time being we fix this.
Hope this post is helpful for understanding and correctly determining which of the two cases you are having troubles with.
Finally, if your scenario is different from the ones described above, I would be please if you share it with us and provide a test project.
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