Implement drop-downs and dialogs
The Popup control shows arbitrary HTML content next to an "owner" element or centered on the screen. It can be used to implement drop-downs and dialogs.
A dialog is a popup without an owner element. Allow users to enter or edit information without leaving the page with a modal or modeless dialog. Use them for alerts or prompts, transitions, and pop-up editors.
Popups are bound to an owner element that controls their position and visibility. Use the showTrigger and hideTrigger properties to determine whether the Popups should be shown or hidden when the owner element is clicked, or when the popup loses the focus.