I am pushing a button to a blip:
Code:
 blip.append(new Element(ElementType.BUTTON,...);

The button is shown in the blip and works fine.

There is an event that as a  response to it I would like to remove the
button from the blip.
Code:
   BlipContentRefs firstButton = blip.first(ElementType.BUTTON);
   if(firstButton != null)
   {
            log.info("found the first button. deleting it");
             firstButton.delete();
   }

But the button is not deleted.
Below is the outgoing operations:


com.google.wave.api.AbstractRobot serializeOperations: Outgoing
operations:
[{"method":"robot.notifyCapabilitiesHash","id":"op31","params":

{"capabilitiesHash":"e16c63dbf7a7","protocolVersion":"0.21"}},

{"method":"wavelet.modifyParticipantRole","id":"op32","params":

{"waveId":"googlewave.com!w+4c7IFrZkBDs","waveletId":

"googlewave.com!conv
+root","participantId":"[email protected]","participantRole":"READ_ONLY"}},

{"method":"wavelet.modifyParticipantRole","id":"op33","params":

{"waveId":"googlewave.com!w+4c7IFrZkBDs","waveletId":"googlewave.com!
conv+root","participantId":

"[email protected]","participantRole":"READ_ONLY"}},
{"method":"wavelet.modifyParticipantRole","id":

"op34","params":{"waveId":"googlewave.com!w
+4c7IFrZkBDs","waveletId":"googlewave.com!conv+root","participantId":

"[email protected]","participantRole":"READ_ONLY"}},
{"method":"wavelet.modifyParticipantRole","id"

:"op35","params":{"waveId":"googlewave.com!w
+4c7IFrZkBDs","waveletId":"googlewave.com!conv+root","participantId":

"[email protected]","participantRole":"READ_ONLY"}},
{"method":"document.modify","id":"op36","params":

{"waveId":"googlewave.com!w+4c7IFrZkBDs","waveletId":"googlewave.com!
conv+root","blipId":"b+RfIXyavlT",

"modifyAction":
{"modifyHow":"DELETE","values":null,"annotationKey":null,"elements":null,"bundledAnnotations":null,

"useMarkup":false},"modifyQuery":{"elementMatch":"BUTTON","maxRes":
1,"textMatch":null,"restrictions":{}}}}]

Please advice.

Avishay

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