*/
public void insert(final ActivityDTO activity)
{
final long streamEntityId = activity.getDestinationStream().getDestinationEntityId();
super.callWriteAction("updateGroupStickyActivity",
new UpdateStickyActivityRequest(streamEntityId, activity.getId()),
new OnSuccessCommand<Serializable>()
{
public void onSuccess(final Serializable response)
{
GroupModel.getInstance().clearCache();