🚀 go-pugleaf

I want user not to be able to run many instances of my application. So if
he tries to run another instance my program should bring the first
instance to top. I've been trying it with this following code:
 
BOOL CMyApp::InitInstance()
{
    If( m_hPrevInstance != NULL )
    {
        m_pMainWindow->BringWindowToTop();
        return FALSE;
    }
    else
    {
        m_pMainWindow = new CMyWindow;
        m_pMainWindow->ShowWindow( m_nCmdShow );
        m_pMainWindow->UpdateWindow();
        return TRUE;
    }
}
 
The first instance runs fine and no other instances are displayed or created
but the first windows is not brought to the top.