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All the nodes in the TreeViewAdv are selected in the startup, then these nodes are added as a child to the last node. This takes more than 20 seconds to get completed fully.

Replication steps: 

  1. Run the sample. 
  2. Notice that the nodes are selected already
  3. Do not click the tree. Click the button which will move all but one child node to be under the one not moved child node.
  4. Note that it takes more than 20 seconds to get completed.