FloatingPane provides flexible support for floating panes which can be resized, minimized/maximized and layered dynamically, similar to application windows within the web page. Unlike dijit.Dialog, FloatingPane is not modal and it is designed to allow multiple active windows. A special dock widget (dojox.layout.Dock) is used to provide the user interface for restoring minimized (docked) windows

There is a video showing how to use the control http://youtu.be/AzxXX9rcaYE