Changing the ValidatorSummary HeaderText

 This is kind of a general ASP question, I'm posting it here because it has something to do with validation.
Well, basically I need to change the HeaderText on a ValidationSummary control: 
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:DynamicDataManager ID="DynamicDataManager1" runat="server" AutoLoadForeignKeys="true" />

<h2>Add new entry to table <%= table.DisplayName % ...