I've got a VB6 program that shows a small window with no titlebar. DF puts its titlebar buttons on the window nonetheless, in the middle of a text input box in the particular case at hand.. (The icon images are custom images.) Is there a way to stop this?

Thanks for the suggestion. I've done that, since posting, and also restricted the width of windows on which titlebar buttons are allowed (I wish there were a vertical restriction as well), and that solves the case of top-level windows. But I have seen a dialog box or two issued from a main window on which I want the titlebar buttons that have, in the dialog, errant buttons. I think there is not a way provided (and likely shouldn't be a way because of complexity) to restrict the buttons on these. I'll happily live with what I see (or ultimately if I can't in a special case then I'll do some kind of adaptation).

As it stands I can live, easily and happily,. with things as they are, but it does seem strange to me that titlebar buttons are allowed to be drawn on windows without titlebars. I would think that the presence or absence of a titlebar is something that could be determined solely by looking at the window properties. "I am not a lawyer trained windows programmer", so likely I am wrong. As for adding compatability constraints on classes and titles, quickly one wants wild cards and regex operators and on and on and on, so I think you are better off with the simplicity of what you now have. Which is very very nice.

That's a good program. What I found with it is that the offending windows, although they do not have WS_CAPTION set, do have WS_MAXIMIZEBOX and WS_MINIMIZEBOX set. If these are toggled off then Display Fusion takes away its titlebar buttons. So I have removed those settings from the offending windows, and removed as well the compatability settings I had given DF, and now things work fine out of the box.

Thanks for the pointer to Window Detective. And for the superb responsiveness of this forum.