AlphaControls seem to spoil an application's resize behaviour.
(I've tried with the latest version, V7.7)
Attached you'll find a little application demonstrating the bug.
The area that is mapped (with alClient) into Panel3 is not resized properly when you use the maximize-button of the form or maximize with doubleclick on title bar of the form.
Attached you'll also find 3 screenshots. The first of the application in normal state, the 2nd after maximizing (buggy, you see the area below button 1 is not drawn and can't be clicked) and the 3rd is amximized and shows the way things should look like.
The problem seems to disappear if you set BevelOuter of Panel1 or Panel3 to something different than bvNone.
AlphaControls-Team, help!!!