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/AddUnimplementedConstructorsAction.java
Shell shell= getShell();
		try {
			IType type= SelectionConverter.getTypeAtOffset(fEditor);
			if (type != null)
				run(shell, type, fEditor, true);
			else
				MessageDialog.openInformation(shell, getDialogTitle(), ActionMessages.getString("AddUnimplementedConstructorsAction.not_applicable")); 
		} catch (JavaModelException e) {
			ExceptionHandler.handle(e, getShell(), getDialogTitle(), null);
		} catch (CoreException e) {
			ExceptionHandler.handle(e, getShell(), getDialogTitle(), null);
		}
	}
	
	private boolean checkEnabledEditor() {
		return fEditor != null && SelectionConverter.canOperateOn(fEditor);
	}	
	
	
	
	private void run(Shell shell, IType type, IEditorPart editor, boolean activatedFromEditor) throws CoreException {
		if (!ElementValidator.check(type, getShell(), getDialogTitle(), activatedFromEditor)) {
			return;
		}
		if (!ActionUtil.isProcessable(getShell(), type)) {
			return;		
		}		
		IMethod[] constructorMethods= StubUtility.getOverridableConstructors(type);
		
		if (constructorMethods.length == 0) {