Test for the qx.ui.popup.Popup widget. qx.ui.popup.Popups are planned as the source constructor for tooltips, menus, ...
There is also a qx.manager.object.PopupManager which hides all registered qx.ui.popup.Popup instances which are configured to auto hide. This is a nice method to omit to show more than one qx.ui.popup.Popup together (omit multiple QxTooltips, ...).
In this example we use a qx.ui.popup.PopupAtom. This is a popup with an automatically included qx.ui.basic.Atom, which allowes you to easily use it for messages to the user or something like this.