CustomMessageBox - InvalidOperationException

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C#

Windows-Phone-8

Hello, when I have one instance of CustomMessageBox (from the WP Toolkit, this code is for Windows Phone 8) and try to use Show() more than 1 time (for example in an event handler):

public partial class MainPage : PhoneApplicationPage
{
        private CustomMessageBox jumpPanel = new CustomMessageBox();

        ...
    
        private void SomeThing_Tap(object sender, System.Windows.Input.GestureEventArgs e)
        {
            ...

            jumpPanel.Show();
        }
}

I get InvalidOperationException by the second call (note that Dismiss() was called in the meantime). However, when I "renew" the object every time:

private void SomeThing_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
    jumpPanel = new CustomMessageBox();

    ...

    jumpPanel.Show();
}

It's alright. I wonder what the cause is? Why does it need to create a new instance? Note that I tried few Show() and Dismiss() calls in a row in the first case and it was alright. Thank you in advance.