Popup
A Popup is a regular UIElement that can float on top of other elements. It doesn’t have any visual appearance by itself, but it can contain any System.Object as the value of its Child property, much like a content control. Besides there being no restrictions on a Popup’s content, there is no restriction on the number of Popups you can show simultaneously (just as with other UIElements). This makes it the most flexible out of all the popup controls. Popups are internally leveraged by XAML controls such as Flyout, ToolTip, and AppBar for overlaying the rest of a Page’s content.
Figure 14.13 demonstrates the behavior of the Popup in the following Page:
<Page ...> <Grid Width="420" Height="420"> <!-- Inner ...
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