Returned block contains :
0 Window handle
4 Visible area minimum x
8 ----------"--------- y
12 Visible area maximum x
16 ----------"--------- y
20 Scroll x offset
24 Scroll y offset
28 Handle to open window behind
This message is returned when window size, or scrollbars are altered. You should call Wimp_OpenWindow using this block. If you have panes, then you should also use the block to find their new position, and use Wimp_OpenWindow on them too.
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