Wizard Form Validation not working

I have a three step Wizard, the validation works in the first two steps when the user clicks the "Next" button, but the validation controls in the final step don't seem to work. Is there a step that I'm missing? I just posted my steps as they appear without the code inbetween the steps. 
<asp:Wizard ID="Wizard1" runat="server" DisplaySideBar="false" NavigationStyle-CssClass="form_nav_style" FinishCompleteButtonText="Next" OnFinishButtonClick="cmd_UserSession" FinishDestinationPageUrl="~/mypage.aspx" OnNextButtonClick="cmd_PrcntSalesValue" ValidateRequestMode="Enabled"> <WizardSteps> <asp:WizardStep ID="WizardStep1" runat="server" Title="Step 1"> // required field validator works </asp:WizardStep> <asp:WizardStep ID="Wizar ...