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