cairo_fill(cr);
//knob color
- cairo_set_source_rgba (cr, _red, _green, _blue, (active_state() == Active) ? 0.8 : 0.2);
+ cairo_set_source_rgba (cr, _red, _green, _blue, (active_state() == Gtkmm2ext::ExplicitActive) ? 0.8 : 0.2);
cairo_arc (cr, 0, 0, _diameter/2-3, 0, 2 * M_PI);
cairo_fill(cr);