Regarding the Alerts getting displayed as 'null'

hi,

I am facing a problem in the alerts.

I am just dragging a text from the linkbar (<mx:LinkBar>). That time I am just throwing an alert.' Do u want to remove the text? '

In the alert box for both OK and CANCEL its displaying as null null.

below is my posted code.

Alert.show("Dragged item '"+draggedLinkButton.label +"' will be removed from Favourite List.\n" +

               "Do you want want to continue?", "Alert", Alert.OK | Alert.CANCEL, this,favouritesRemoveHandler, null, Alert.OK);

Also Iam attaching the images.

Also Im using super panel opening as a pop up to display some contents.If Iam  opening the super panel and after that  if I drag any text from the linkbar, now the Ok and CANCEL button gets appear.

It would be greatful if any one can point where im wrong

Thanks a lot .

selva.