Sorry, I should have been a little clearer in my previous message:

If the node doesn't exist This.Nodes[SelectedKey] gives an error. I need to determine if it exists before I call that.

>Hi Roi try the following:
>

>lonode = This.Nodes[SelectedKey]
>IF VARTYPE(lonode) = 'O'
>   This.SelectedItem = lonode
>ENDIF
>

>>I have a method that rebuilds all the nodes in a treeview.
>>
>>I save the currently selected node with:
>>

SelectedKey = This.SelectedItem.Key

>>
>>Then I clear all the nodes and rebuild the tree.
>>
>>Then I want to reselect the Selected item with:
>>

This.SelectedItem = This.Nodes[SelectedKey]
>>This.SelectedItem.ensurevisible

>>
>>However sometimes the SelectedKey doesn't exist once the tree is rebuilt. Is there an easy way to determine that? I can't spin through all the keys because I build each branch dynamically as it is expanded. The only thing I've can think of is setting it, catching the error if it doesn't exist, and going on from there.
>>
>>tia