Making dialog controls resizable is fairly easy. However, this presents several problems:
1) To make a control resizable and let Windows handle the resizing, means that there will be a thick frame around the control (much like the thick frame that the users normally grab on to on the edge of a window to resize) I'm assuming this isn't what you want.
2) If you're trying to make a dialog creator, I would guess that you wouldn't want the controls to act as normal (i.e. reacting to button clicks and such) This requires a little more coding.
3) You wouldn't be able to just move things; it would always have to be resizing.
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