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GWT - Add and remove nodes in celltree

 
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Here I have an complete and very easy example to dynamically add/remove nodes to an celltree.
My example is not working very well. It seems there is an refresh problem.
Only closing/expanding the nodes will show the correct result. I also did not found any answer in this forum which fits to this problem.
Maybe somebody can try my example and tell me where the problem is. Any other hint is also very appreciated.

Greetings, Marco

 
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