The Popup control enables you to add small overlays of arbitrary content to your applications, as popovers or modal dialogs. Popovers are the popups which have owner elements to control their visibility, and are placed relative to these owner elements when they appear on the screen. Whereas, dialogs are the popups with no owner elements, and they appear towards the center of the screen distinguished from the rest of the content on the screen.
In the image below, buttons are clicked to display a drop-down or a dialog:
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