title: I want a popup with a cancel button. Is it a good idea to use an AJAX Popup control extender?
body: <p>Please note this is a popup and NOT modal popup. The users do not want a modal popup.
  Is it a good idea to use an Ajax Popup Control extender in the following circumstances;
  I want to populate a textbox. When the user clicks on it, he sees a popup window.
  In the popup window you can enter value of the field, or make a selection from a drop down list. When you have decided, you can either click on a submit button to commit your changes, or click on a cancel button to ignore your changes.
  By experimenting I have found how to do this, apart from the cancel button.
  How do I do this? Or should I try something else?</p>