How to show a full screen Modal ContentDialog in Windows Phone 8.1

Question

When a user is trying to login to my app, I am displaying a ContentDialog containing a few TextBlocks and a ProgressBar.

I choose ContentDialog because it is modal a

Answer 1

I found a solution which eliminates the code behind. Not sure if this is more of a work around. But it allows me to easily use Binding to decide when to display this modal dialog and when to hide it.

This is my XAML

I play around with the visibility of the Grid that has Canvas.ZIndex="1" using Binding and decide when to display the modal window.