Normally, this is only valid for window or child window components.
If no caption is present, or the component does not support captions, the
engine should return "<SAFS_NULL>".
The Android Engine also persists these values as SAFS variables.
^DroidEngine.Command = [command]
^DroidEngine.StatusCode = [statuscode string]
^DroidEngine.StatusInfo = [statusinfo]
See DEngineCommandProcessor.setStatusVars().