Represents a dynamic collection of data owned by the IPageElement that owns the script.
public Expando ElementData {get;}
This property is a special expando object whose member variables are dynamically created as they are accessed.
This allows a script writer to add new items to ElementData easily and naturally.
For example, this script assigns a value to the
LastInput property of ElementData:
ElementData.LastInput = the_value;
This intrinsic object is available to page element property script bindings and event handlers. For page-level and application-level scripts, this reference returns null.