How to handle back button in windows phone 7?

I have an application, the main page contains few functions. To explain in detail - I have save, color palette button in my main page. When any of these buttons are clicked, save pop 开发者_运维技巧up or color palette appears. How to handle back button of the device, when color palette or save pop up is opened. When back button is pressed at these scenario it should just make them invisible and stay on the main page. When nothing is being performed in the main page, then it should come out of the app. I tried to make their visibility collapsed on back button press. But it still is coming out of the application.

Please, guide me in this. Thanks in advance.

Override PhoneApplicationPage.OnBackKeyPress and then set CancelEventArgs.Cancel to true if you want to stop it from actually going back.

protected override void OnBackKeyPress(CancelEventArgs args)
{
    if (PanelIsShowing)
    {
        HidePanel();
        args.Cancel = true;
    }
}

The back button behaves as is intended by Microsoft.

If you change its behavior you risk your application not being certified for the Marketplace.

If you want the back button to close the popups, turn the popups into pages so the back button navigates back to the main page..

You need to use

protected override void OnBackKeyPress(CancelEventArgs e)
{
    if (_popup.IsOpen)
    {
        _popup.IsOpen= false;
        e.Cancel = true;
    }
    else
    {
        base.OnBackKeyPress(e);
    }
}

That should do the trick.