public Control createControl(Composite parent) {
   control = new Composite(parent, SWT.NONE);
   control.setLayout(bl);
   constants.createControl(control);
   dependency.createControl(control);
   enableComponent(-1);
   return control;
 }
 public void setSelected(FModel fmodel) {
   if (selectedModel == fmodel) return;
   selectedModel = fmodel;
   if (selectedModel instanceof FConstantsModel) {
     currentEditor = constants;
     enableComponent(0);
     constants.setFModel(fmodel);
     dependency.setFModel(null);
   } else if (selectedModel instanceof FieldModel) {
     fmodel = ((FieldModel) fmodel).getDefaultDependency();
     dependency.setFModel(fmodel);
     dependency.getFieldEditor().setEnabled(true);
     constants.setFModel(null);
     if (currentEditor != dependency) {
       currentEditor = dependency;
       enableComponent(1);
     }
   } else if (selectedModel instanceof DependencyModel) {
     dependency.setFModel(fmodel);
     dependency.getFieldEditor().setEnabled(false);
     constants.setFModel(null);
     if (currentEditor != dependency) {
       currentEditor = dependency;
       enableComponent(1);
     }
   } else if (currentEditor != null) {
     currentEditor = null;
     enableComponent(-1);
     constants.setFModel(null);
     constants.setFModel(null);
   }
   selectedModel = fmodel;
   control.getParent().update();
   control.update();
   control.layout(true);
   control.redraw();
 }