Adding new flags?

Nikolay Sivov bunglehead at
Fri Apr 10 04:15:08 CDT 2009

Igor Tarasov wrote:
> Hi there!
> I try to implement as precise as possible one undocumented feature in
> comctl32, this all deals with one structure field. After lots of
> testing I know the following:
> 1. Default value for that field returned by getter is 0.
> 2. By default it is ignored in behavior.
> 3. If you change value by the setter, even to 0, behavior changes.
> 4. Negative values, such as (-1) also produce different behavior and
> cannot be used as "field not changed" flag.
> So, does that mean that I have to add new flag to the structure that
> would be set only if that field is changed, or there is another way to
> do that?
What flag are you speaking about? Toolbar stuff?

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