class MyWindow : public TopWindow {
 MessageCtrl messages;
 DocEdit     editor;
 RichEdit    richeditor; 

 void DisplayEditorErrorMessage() { 
      messages.Error(editor, "This is an error message.");
 }

 void DisplayRichEditorSuccessMessage() {
      messages.Success(richeditor, "This is a success message.");
 }

 // Other members, constructors, etc...
};