How to programmatically select an item of a tree?

I,
I have a vi that I want to use only with a keyboard. There is a tree in this one. In this vi we can select an item, with the arrows of the keyboard, and put the color of the item background red or green.
After a loop to put all red, (property node, ActiveItem->Line and ActiveCell->background color), the active item is the last of the tree, but the selected item isn't the same. If I set the Active Item to 0 after the loop, and then I press down arrow of the keyboard, the item selected will be the next after the one before the loop, and it's not from the start of the tree.
(Sorry for the English)
I want to select a Cell Prgrammatically but I didn't find anything in the property or Invoke nodes...
Thanks a lot.
Barto

Here is the little program who illustrates my answer.
Thanks for helping me.
Barto
Message Edité par Barto le 01-31-2007 07:55 AM
Attachments:
Tree problems.vi ‏16 KB

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