We'd like to support the ability to associate a panelPopup component (that could contain virtually anything) with another component in such a way that when the user hovers the mouse over the target component for a configurable period of time (ex. 30ms) the panelPopup would display at a location based on the current mouse coordinates. When the user moved the mouse off the target component, the panelPopup would hide/close.

We should consider supporting the following configuration attributes:
- hoverDelay - # of millis that mouse must be continuously hovered over the component before the popup is displayed.
- autoHide - Different value settings for:
   - "onClick" - Hide the popup if any area outside of the popup itself is clicked.
   - "onExit" - Hide the popup when the user moves the mouse out of the triggering component.
   - "none/false" - Don't autohide the popup (expects the app. to add a close button or some other device to hide the popup).

This should work like the popupMenu where you associate a popupMenu on the page to one or more panelGroups via the popupMenu attribute. We do the same for this, have a popupPanel attribute on the panelGroup that you use to associate a popupPanel to the panelGroup, then wrap any components or regions that you want to have the popupPanel capability with a panelGroup. Eventually would could consider adding the "popupPanel" attribute to all components, but maybe having it on the panelGroup is enough?

The other issue is whether this just displays a static panelPopup or if there is a roundtrip and the application can receive an event that can be used to populate the panelPopup or set it's state based on the component that is triggering the popup. This would be desirable if it's technically feasible.

Also should work in UIData components, of course.

Seems to be very similar in nature to the popupMenu.