Is there a way, to integrate the XamDialogWindow in the hidden state?

Im trying this in my Xaml Main View:

<UserControl
<StackPanel>
            <ig:XamDialogWindow
                Width="200" Height="200" Visibility="Hidden"
                Content="This is a sample dialog window"
                IsModal="True" StartupPosition="Center" />

..

I want to use the XamDialogWindow for ask the user, if he is sure to save the data.

But always i open the View, then the "PopupWindow" is always visible from the beginning.