//Create view item window and populate with selected item details
protected void OnViewEvent(object sender, System.EventArgs e)
{
StockView view = new StockView (stock_list, app, 2);
StockItem s = TreeviewSelectionEvent (this, e);
view.BuildView (s);
view.Show ();
}
//Create update item window
protected void OnEditEvent(object sender, System.EventArgs e)
{
StockItem s = TreeviewSelectionEvent (this, e);
if (s != null) {
StockView view = new StockView (stock_list, app, 2);
view.BuildView (s);
view.Show ();
} else
YouHaventSelectedMsg ();
}