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JTree Problem

 
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hi,
I am using a JTree in my swing application.Sometimes when i try to expand a node,at that time the cursor becomes stop sign (i.e., circle with crossmark) and it doesn't go away after node expansion.
To get back to normal arrow cursor,i need to click on anywhere on the GUI.
why this problem occurring ???
Please help me out ...
Thanks,
Manikandan
 
It is sorta covered in the JavaRanch Style Guide.
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