Can't get Autoit created TreeView Children

I am using this function to get the first item of an Autoit created TreeView.

Local $TIDNumItem = _GUICtrlTreeView_GetFirstItem($TreeView1)

I am using the Autoit Debuger to see the value and it says ' '
It does not even has a '0'

Please help, I have been stock on this for a long time.