I have a WIN32 application that uses a main dialog window as background and several alternative dialogs that can appear in front of the main window. These overlay dialogs should not have any border because they need to appear to be part of the main window.
Everything was working well until I activated Dynamic Layout on the controls in an overlay dialog. It then acquired a thin border with drop shadow, a thin top bar that was sometimes windows top bar color and sometimes white, and the dialog became independently resizable. I don't want this, I want the overlay dialog to resize only with the main dialog window.
How can I force the dialog to have No Border?