Produce an element that represents the rubber band that the user can stretch when dragging in the background to select multiple objects, if SupportsSelection is true.
This produces a simple group with a single rectangle element. The elements generated here are defined to work with the standard JavaScript defined in the ScriptFile. If you change them, you may also need to change and/or add script functions. This method does nothing if SupportsSelection is false, or if Scripting is false.