helper Visual
{
    public class VisualCI : Native.ContructInfo
    {
        public  int         pgadParent;
    };

    public Visual(Visual vParent)
    {
        VisualCI ci = new VisualCI();
        ci.pgadParent = vParent.pgad;
        int pgad = Native.BuildGadget(idVisual, ci);
        if (pgad != 0)
        {
            this.pgad = pgad;
        }
        else
        {
            uint error = Native.GetLastError();
            throw new System.SystemException("Unable to create new Visual");
        }
    }

    public Visual(HGadget gadParent)
    {
        VisualCI ci = new VisualCI();
        ci.pgadParent = Native.CastGadgetDirect(gadParent.hgad);
        int pgad = Native.BuildGadget(Native.FindGadgetClass("Visual", 1), ci);
        if (pgad != 0)
        {
            this.pgad = pgad;
        }
        else
        {
            uint error = Native.GetLastError();
            throw new System.SystemException("Unable to create new Visual");
        }
    }
};