BOOL ResizePalette( UINT nNumEntries );
nNumEntries
Specifies the number of entries in the palette after it has been resized.
Changes the size of the logical palette attached to the CPalette object to the number of entries specified by nNumEntries. If an application calls ResizePalette to reduce the size of the palette, the entries remaining in the resized palette are unchanged. If the application calls ResizePalette to enlarge the palette, the additional palette entries are set to black (the red, green, and blue values are all 0) and the flags for all additional entries are set to 0.
TRUE if the palette was successfully resized; otherwise FALSE.
::ResizePalette