title: Why don't forms receive WM_NOTIFY messages for children of a TFrame?
body: <p>The WM_NOTIFY message is often used for in-place "tool tips" (message balloon) and other control notifications, but if I place a control on a TFrame, then WM_NOTIFY messages never occur for those controls. Why aren't those messages sent to my form anymore, and what can I do about it?</p>