Removing ClickHandler from Button

Hi

I have a link that shows a dialog box that asks for some input. I have
two buttons on the dialog box:

1) Send request to server

2) Cancel and close i.e. hide the dialog box

If you click on the cancel it hides the dialog, but if you then re-
click on the link to open the dialog box and Send the request the
server it sends the input twice.

I think this is because addClickhandler is added twice as the dialog
has been open twice. To stop this do I remove the Click handler when
cancel button is closed?

Do I have to use the HandlerRegistration to do this?

Does anyone have any good examples they could post.

I am not able to post the code at the moment but can do later when
home...

Thanks in advance

CM

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