Commented Issue: ConfirmButtonExtender does not support validation [16454]

The ConfirmButtonExtender does not support validation. For example, I have a text box with the ValidationGroup attribute set to "Add", and a button with the ValidationGroup attribute also set to "Add". I then put a ConfirmButtonExtender on my page and set the target control ID to point to my button. When I click the button with the textbox empty, the confirmation box is displayed before validation occurs.
Comments: It seems this is still not fixed in 60501 its a big problem and a must have feature...