Page_ClientValidate() not showing up

Question

Hi

I have a strange issue. Do not know why it is happening.

I have a simplemodal by jquery (http://www.ericmmartin.com/projects/simplemodal/)

I have a few ASP.NET controls inside my div. Now this is what happens:

1. I open the modal using the show modal button -> it pops-up
2. I deliberately leave empty values and click my button, it "shows" the red color *s
3. Now i close my modal and reopen it
4. repeat step 2, but do not see the red *s anymore.

The Page_ClientValidate("name of validation grup") is firing as there is an update user function that executes if everything is fine. It is not firing, means validations are taking place but there are no red *s seen.

Where could be the problem?