Bug 41491 Add constructors from fields issues
200300813 a. add visibility buttons like 'Add constructor from super class'
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/GenerateNewConstructorUsingFieldsAction.java
private Composite addSuperClassConstructorChoices(Composite composite) {
			Label label= new Label(composite, SWT.NONE);
			label.setText(ActionMessages.getString("GenerateConstructorUsingFieldsSelectionDialog.sort_constructor_choices.label")); 
			GridData gd= new GridData(GridData.FILL_BOTH);
			label.setLayoutData(gd);
			final Combo combo= new Combo(composite, SWT.READ_ONLY);
			for (int i= 0; i < fSuperConstructors.length; i++) {
				combo.add(JavaElementLabels.getElementLabel(fSuperConstructors[i], JavaElementLabels.M_PARAMETER_TYPES));
			}
			
			combo.setText(combo.getItem(0));
			combo.setLayoutData(new GridData(GridData.FILL_BOTH));
			combo.addSelectionListener(new SelectionAdapter() {
				public void widgetSelected(SelectionEvent e) {
					fSuperIndex= combo.getSelectionIndex();
					updateOKStatus();
				}
			});
			return composite;
		}
		public int getSuperIndex() {
			return fSuperIndex;
		}
		public CheckboxTreeViewer getTreeViewer() {
			return fTreeViewer;
		}
		public IMethod getSuperConstructorChoice() {
			return getSuperConstructors()[getSuperIndex()];
		}
		private class GenerateConstructorUsingFieldsTreeViewerAdapter implements ISelectionChangedListener, IDoubleClickListener {