Treeview SelectedNode

I have an application with a Treeview control that was created using VS 2003
and Framework 1.1. I have since upgraded to VS 2005 and Framework 2.0. I have
found that the SelectedNode property of the Treeview control is no longer
updatable programmatically. No error. Just doesn't update in code. It appears
as if it's being treated as a web Treeview instead of a winform Treeview. The
control is definitelyinstantiated as System.Windows.Forms.TreeView.
So now the code is no longer working properly where I simply trying to
programatically set the selected node in the control.
Any help or insight is greatly appreciated.
Thanks,
Lee