If a tree is collapsed when the tree view is first rendered, the node won't be able to drag and drop on or around its siblings
Steps to reproduce:
1. load the TreeView Demo
2. Locate A.TreeView Folder Style
3. Expand "CachedTreeNodeIO"
4. Attempt to drag a child on to or around any of its siblings
The child node is unable to drag on or around any of its siblings.
Note: This doesn't seem to apply to the Simple Style example.
Note #2 It seems like this is only happening on trees that render from an IO call.
Note #3 the DD Delegate in TreeView is not taking care of our new TreeNodes that get created in runtime. basically any TreeNodeIO