Thank you for the info!

Have a look at the source code. It gets a bit convoluted but you can trace through the implementation if you dig enough. Cheers, Ash

Doc Lobster wrote: Calling SetItemState(-1, ...) takes about the same time as any other SetItemState(...) call, even if it alters all items. I think this is a good hint. (Un)fortunately 'debugging' is your only friend. :) If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

Of course in C++ the comma operator can be overloaded like most others. So one can make things really interesting.

Thanks for the idea, but my experiments didn't work out. MFC seems to be restrictive what window styles are set and also who the parent window is. The best option I found for this works like described here[^]. I believe there is also a code project article explaining this method but I can't locate it right now.