I didn't test that version because I didn't notice the real difference from the original example. Thanks also for pointing that out.

I'm still thinking what will I do: to modify my code to add the GUI part or to write a wrapper for it.

Either way, I need more examples to identify the things I need... I've never developed GUIs in Windows, just traced and debugged them, but I'm not sure how are all that stuff named!!! An ancient newbie ;-)