| isValid | 
        Indicates if this object is still valid, i.e. hasn't been deleted or some other action done to invalidate the reference. | 
      
      
        | name | 
        The name of the event - e.g. "DocumentOpening" | 
      
      
        | objectType | 
        This property is supported by all objects in the API and returns a string that contains the full name (namespace::objecttype) describing the type of the object.
   It's often useful to use this in combination with the classType method to see if an object is a certain type. For example: if obj.objectType == adsk.core.Point3D.classType(): | 
      
      
        | sender | 
        The object that is firing the event. For example, in the case of a command input event this will return the command. |