You might ask why you would use the C1Popup control when you can just use the Popup class. While the C1Popup control is based on the primitive Popup class, it provides additional functionality and flexibility.
For example:
•The C1Popup control works like a regular UI control in that it adheres to standard layout conventions.
•You can work with C1Popup in XAML to have more control over the size and appearance of the control and its content.
•The C1Popup control also includes additional features, such as built-in support for animation, back button support, and better performance.