Determines whether the current request is a Callback for the control. Useful if you want to route a callback through special handling.

Generally you'll need to check for a callback and provide special handling for it. For example, you might do:

FUNCTION OnLoad()

IF THIS.LookupPanel.IsCallback
   this.HandleCallback()
   RETURN
ENDIF

*** Continue with non-Callback Page processing

ENDFUNC

FUNCTION HandleCallback()

*** Generate any kind of output
loError = CREATEOBJECT("wwWebErrorDisplay")
loError.width = 350
loError.ShowMessage("Hello Cruel World

*** Write out the raw Response
Response.Write(loError.Render())

*** Make sure no further output is generated
Response.End() 

ENDFUNC

Class wwWebAjax