[DllImport("gtksharpglue")]
static extern int gtksharp_button_get_in_button (IntPtr button);
[DllImport("gtksharpglue")]
static extern void gtksharp_button_set_in_button (IntPtr button, int b);

public bool InButton {
	get {
		return gtksharp_button_get_in_button (Handle) == 1 ? true : false;
	}
	set {
		gtksharp_button_set_in_button (Handle, value ? 1 : 0);
	}
}