msos2.hlp (Table of Contents; Topic list)
CS_SIZEREDRAW
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CS_SIZEREDRAW  Causes the window to receive a WM_PAINT message and be
completely invalidated whenever the user resizes the window, even if it is
made smaller. (Typically, only the uncovered area of a window is invalidated
when the user resizes a window.) The system positions the resized window
relative to the lower-left corner of its parent window. Without this style,
the system positions the window relative to the upper-left corner of its
parent window. This class style is useful when an application scales
graphics to fill the current window.
 
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