static {
   m_upimage = FormDesignerUtils.loadImage(Icons.UP_16);
   m_downimage = FormDesignerUtils.loadImage(Icons.DOWN_16);
   m_emptyheaderimage = FormDesignerUtils.loadImage("emptytableheader16.gif");
 }
 public Dimension getPreferredSize() {
   return FormDesignerUtils.getWindowDimension(this, 250, 150);
 }