public override void SetMinSize(int width, int height)
{
Gdk.Geometry g = new Gdk.Geometry();
var dec = GetDecorationSize();
g.MinWidth = width - dec.Horizontal; //note: gtks size functions are in client area
g.MinHeight = height - dec.Vertical;
window.SetGeometryHints(window, g, Gdk.WindowHints.MinSize);
}