Use this attribute to specify which attributes you would like to listen to. Whenever the
value of the attribute changes, RapaGUI will run your event handler. Multiple attributes
have to be separated by semicolons. For example, to listen to the attribute
Listview.Active and Listview.DoubleClick, you would have to pass
the string "active; doubleclick" here.
To set up or remove notifications outside XML declarations, use the function moai.Notify().
See moai.Notify for details.