// topleft, sized
public ImageElement AddTextFixedSizeC(Point topleft, Size size, string label, Font fnt, Color c, Color backcolour, float backscale, bool centered, Object tag = null, string tiptext = null, StringFormat frmt = null)
{
ImageElement lab = new ImageElement();
lab.TextFixedSizeC(topleft, size, label, fnt, c, backcolour, backscale, centered, tag, tiptext, frmt);
elements.Add(lab);
return(lab);
}