Validate DropDownList with CascadingDropdown

I can't get this to validate. The same works for my regular DDLs without cascadingdropdown extenders. But this one will not work. I tried to set controltovalidate="CascLessonDay" but it is not recognized at run time as a control that can be validated.

the other thing is, is that this is within a createNewUser wizard control, and it is hard to access the next button for me, so I dont' know how to validate this ddl to make sure that the user selects something.

Thank you.
<asp:DropDownList ID="LessonDay" runat="server" >
                    </asp:DropDownList>

<asp:CascadingDropDown ID="CascLessonDay" ParentControlID="Teacher1" Category="day2"
       PromptText="Select Day"
        ServiceMethod="GetDay"
         ServicePath="~/Teachers.asmx"
          TargetControlID="LessonDay" runat="server">
                </asp:CascadingDropDown>

       <asp:CompareValidator ID="CompareValidator1" ControlToValidate="LessonDay" Operator="notEqual" ValueToCompare="0" ErrorMessage="Please select day" runat="server">*</asp:CompareValidator>

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mlg101Asked:
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rajeeshmcaConnect With a Mentor Commented:
Hi mlg101,

Add the PromptValue property for the Cascading dropdown control...

<asp:CascadingDropDown ID="CascLessonDay" ParentControlID="Teacher1" Category="day2"
                PromptText="Select Day" PromptValue="0" ServiceMethod="GetDay" ServicePath="~/Teachers.asmx"
                TargetControlID="LessonDay" runat="server">
            </asp:CascadingDropDown>
            <asp:CompareValidator ID="CompareValidator1" ControlToValidate="LessonDay" Operator="NotEqual"
                ValueToCompare="0" ErrorMessage="Please select day" runat="server" >*</asp:CompareValidator>

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bureshdCommented:
use a Required Field Validator instead.

<asp:requiredfieldvalidator ID="ReqVal" runat="server"   errormessage="RequiredFieldValidator" InitialValue="0" ControlToValidate="LessonDay" ErrorMessage="Please select day"></asp:requiredfieldvalidator>

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mlg101Author Commented:
That does not work either. When I click the button, it just goes to the next page without any selection
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bureshdCommented:
set the button and validator with the same validator group....and make sure the button cause validation
<asp:requiredfieldvalidator ID="ReqVal" runat="server"   errormessage="RequiredFieldValidator" InitialValue="0" ControlToValidate="LessonDay" ErrorMessage="Please select day" ValidationGroup="check"></asp:requiredfieldvalidator>

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mlg101Author Commented:
I can't find the "next" button in the createuserwizard...where is it?
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