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Multiple Validation Summarys
Steps to replicate
Add two asp panels with a a textbox, requiredfieldvalidator and a validation summary.
Add modalpopupextenders for each panel.
Create a asp button that programmatically displays the popups due to a postback.
A work around is to simply remove the validation summary out of the first panel. If you have more then one modal popup, then only one panel (and for whatever reason it MUST be the last one) can only have a validation summary .