hi,

i do use Xbase++ activeX with M$ MapPoint (2004 Europa)

on my Dialog i have a SLE where i can enter a Customer ID
and it will use FindPushPin to search for a PushPin, center it
and display other PushPin Nearby. this all work.

now i try to SubscribeEvent
*** snip ***
cEventName := "SelectionChange"
xVar       := oApp:oMap:isEventPublished(cEventName)
IF xVar <> Nil
 lSuccess := oApp:oMap:SubscribeEvent(xVar,{| NewSelection, OldSelection |;
                           oApp:MPSelectionChange(NewSelection,OldSelection) 
  })
ENDIF
*** eof 

this Event is fired when i click on a other PushPin. It will get its
Location
and store its :name = Customer ID into SLE
*** snip ***
METHOD XbMap:MPSelectionChange(NewSelection, OldSelection)
LOCAL oLoc
LOCAL cName

   oLoc := NewSelection:Location()
   oLoc:GoTo()

   cName := oLoc:Name()
   ::oDlgMap:oSeek:setdata( cName )

RETURN self
*** eof ***

this also work as expected, but now if i press my OK Button it crash
*** snip ***
oError:args         :
          -> VALTYPE: U VALUE: NIL
oError:canDefault   : N
oError:canRetry     : N
oError:canSubstitute: J
oError:cargo        : NIL
oError:description  : Parameter hat falschen Typ
oError:filename     :
oError:genCode      :          2
oError:operation    : Location
oError:osCode       :          0
oError:severity     :          2
oError:subCode      :       1025
oError:subSystem    : BASE
oError:thread       :          4
oError:tries        :          0
-----------------------------------------------------
CALLSTACK:
-----------------------------------------------------
Called from XBMAP:MPSELECTIONCHANGE(3494)
Called from (B)JOBMAP(192)
Called from ACTIVEXOBJECT:COMDEFAULTHANDLER(702)
Called from XBPACTIVEXCONTROL:COMDEFAULTHANDLER(3094)
Called from AUTOMATIONOBJECT:NOMETHOD(961)
Called from XBMAP:SHOWRADIUS(3174)
Called from (B)XBMAP:MAPINIT(1934)
Called from JOBMAP(214)
Called from OPENMP1THREAD(1627)
*** eof ***
i realise that i might have made a "recursion" and got a Error, but what i
like to know where COMDEFAULTHANDLER is comeing from ?

i did not see it before when i have not SubscribeEvent any Event ?

i did have try my own COMDEFAULTHANDLER before ( without any
SubscribeEvent ) but i did not "reach" it.

so my Question is :  do i NEED to SubscribeEvent at least 1 Event to
"reach" my own COMDEFAULTHANDLER ?

greetings by OHR
Jimmy