GTKD - overrideBackgroundColor of Button doesn't work

[Gerald via Digitalmars-d-learn]

On Wednesday, 15 June 2016 at 09:03:45 UTC, TheDGuy wrote:
> Hello,
> why does this code not work?
>
>         RGBA rgb = new RGBA(1,0.5,0.5,1.0);
>         Button btn_1 = new Button("Start");
>         btn_1.overrideBackgroundColor(StateFlags.NORMAL, rgb);
>
> The color of btn_1 just doesn't change.

https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-override-background-color