Offset Contents
0 dialogue flags
4 pointer to the title to be used, or 0 for a default title
8 x coordinate of top left of the visible area of the dialogue
12 reserved (must be &80000000)
16 reserved (must be &7FFFFFFF)
20 y coordinate of top left of the visible area of the dialogue
24 reserved (must be 0)
28 reserved (must be 0)
32+ colour descriptor
ColourPicker block flags
Bit Meaning if set
0 dialogue has a None button
1 dialogue has the None button selected
2-3 dialogue button type, defining when ColourPicker_Changed is issued for it:
0 = never issued
1 = issued on any change, except during drags, which give a message at drag end
2 = issued on any change, including during drags
3 = reserved
4 dialogue ignores Message_HelpRequest messages
5 dialogue doesn't pass on unhandled key presses to the wimp
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