I am very much new to Qt and I have a simple doubt on switching between the windows.

I have a main window and I am creating a secondary window using a different class. I am hiding the primary window using hide( ) function and only the second window belonging to different class is visible. When the user presses the close button I have to show back the first window. My code looks something like this.

main.cpp
Qt Code: 
  1. #include "FirstWindow.h"
  2. int main(int argc, char *argv[])
  3. {
  4. 	QApplication a(argc, argv);
  5. 	FirstWindow w;
  6.  
  7. 	w.setAttribute( Qt :: WA_QuitOnClose );
  8. 	w.show();
  9. 	return a.exec();
  10. }
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Important lines belonging to FirstWindow.h.
Qt Code: 
  1. #include "SecondWindow.h"
  2. class FirstWindow : public QDialog
  3. {
  4. 	Q_OBJECT
  5.  
  6.              private:
  7.  
  8.                     SecondWindow * window2;
  9.  
  10. 	public:
  11.                    void some_function( ){
  12.  
  13.                              this -> hide( );
  14.                              window2 = new SecondWindow( );
  15.                              window2 -> displayTheWindow( );
  16.                    }
  17. }
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Important lines belonging to SecondWindow.h

Qt Code: 
  1. class SecondWindow : public QDialog
  2. {
  3. 	Q_OBJECT
  4.  
  5. 	private:
  6.  
  7. 		QDialog * dialog;
  8.  
  9.             public slot:
  10.  
  11.                          void startFirstWindow( );
  12.  
  13.             public:
  14.                   SecondWindow( ){
  15.                       dialog = new QDialog( );
  16.                       connect( this, SIGNAL( rejected( ) ), this, SLOT( startFirstWindow( ) ) );
  17.                   }
  18. }
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Can anybody please help me how should I write the slot of startFirstWindow( ). I just want to make the first window visible again. Or is there another approach to this without much changes.

Thanks in advance for the help.