Programmatically close ListPicker from WP7 Silverlight Toolkit

Question

My app is being rejected from the Marketplace because of requirement 5.2.4.c (back button must close menu or dialog and cancel back navigation). I'm using a ListPicker from the Silverlight Toolkit and that's what's causing the failure: pressing the back button when the ListPicker is open goes back instead of closing the ListPicker and cancelling back navigation.

This seems simple enough to fix: if the user presses the back button and the ListPicker is open, I close it and cancel back navigation. However, I haven't seen a way of programatically either detecting whether a ListPicker is open, or closing a ListPicker.

Am I missing something? How could I fix this bug?

Answer 1

One again, I have asked the question too soon. The answer is here: http://silverlight.codeplex.com/workitem/7643

Answer 2

The solution is

protected override void OnBackKeyPress(CancelEventArgs e)
{
    base.OnBackKeyPress(e);
    if (yourListPicker.ListPickerMode == ListPickerMode.Expanded)
    {
        yourListPicker.ListPickerMode = ListPickerMode.Normal;
        e.Cancel = true;
    }
}