ValidationSummary not working correctly

[marc]

I have a page that has a validation summary control. On this page I have a
nested user control (Control1). Inside Control1 is another nested control
(Control2). I have a CustomValidator on a textbox inside Control2.
Although the validation works on this textbox, the error message doesn't get
bound to the ValidationSummary control. Is there limitations to the
ValidationSummary control with nested controls? Any ideas?

Thanks