How change window Backgound Color when press a Button when using "ResEdit Resource Editor" to design?

[bauss]

On Thursday, 30 January 2020 at 03:49:29 UTC, Marcone wrote:
> I created a GUI using "ResEdit Resource Editor" and embeded to 
> Dlang using this code above. Now I want to change the window 
> Backgound Color when press a Button. How can I make it?
>
>

You need to handle WM_ERASEBKGND

And then you can set it using CreateSolidBrush and 
SetClassLongPtr with GCLP_HBRBACKGROUND