Hello, When I run itemcheck before showing the dialog I am able to check the state of the checkbox and I think I am able to set it, although it does not display in the window. If I do a itemcheck again to check the state of the node, it returns a 1, but the display is not updated. If I do the same command from a button on the gui the tick is set or removed correctly. I am using Itemcheck(node,1) to set the check and Itemcheck(node,0) to clear it. If this is a bug or other problem, can anyone suggest a way around the problem, maybe a way to trigger a button push after the gui has started. The reason for all this is I would like to check some nodes by default at start-up. Thanks for any help. Paul