ICallingContext
Represents information about the web context from which the event handler is
being called, such as the layout or page mode.
Gets or set a ILayout containing
the GUIDs and artifact ID of the layout associated with a call to an event handler.
Gets or sets the information needed by the event handler about the step in the
page workflow associated with a call, such as a layout, list, edit, or other
Gets or sets a string indicating where the call to the event handler originates.