/**
  * create control, its label control and maintain all relationships
  *
  * @param control control to create
  */
 protected void createControl(RCPControl control) {
   Validate.notNull(formToolkit);
   control.setRcpParent(currentParent);
   control.createUI(formToolkit);
   createdControls.add(control);
 }
 protected AbstractBuilder(FormToolkit formToolkit) {
   Validate.notNull(formToolkit);
   this.formToolkit = formToolkit;
 }