I just found the answer.
I should have use
o=thisForm.treeviewcontrol
keyofparent=o.selecteditem.Parent.Key
Thanks!


>In the click(), a reference to the currently selected node is passed. So, in the
>click, you could have code like this:
>
>Lparameters node
>
>selectedkey = node.key
>
>To get a reference to the parent, you could do this:
>
>parentkey = node.parent.key
>
>If a parent does not exist, an ole error will be surfaced. So, you will need to make code like this a bit more robust, as follows:
>
>If Type("node.Parent.index") = "N" && a parent does exist
>Else
> */ no parent exists
>Endif