Windows Phone Back Button Navigation

Hi,

So in my Windows Project I have the Hardware Back Button pressed code

 void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
        {

            if (OnPageMenu == false)
            {
                e.Handled = true;
            }
            else
            {
                e.Handled = false;
            }
}

On my menu page in the PCL I set the bool to false if its not on the menu page. But if its on the menu page I don't want the back button to do anything but e.handled = false just closes the whole app and e.handled true moves to the login page which i don't want. I just want it to stay on the page if its on the menu.

Thanks in advance.