Tree selection doesn't work when vi running

I've added a tree control to my LabVIEW app with 6 columns, the
children each have unique tags as does the parent. I can not
select any of the items while my VI is executing -- I can, however,
make selections when the app is not running. The selection mode
is "0 to 1 item".
Any thoughts?
...Dan

It IS enabled. When copying the tree to a new VI and doing a "Run Continuously",
nothing can be selected. I've posted the file to
http://home.earthlink.net/~dgholstein/problem_tree.vi in case someone
would like a look. Thanks in advance for your help.
...Dan
Attachments:
problem_tree.vi ‏9 KB

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