Get value from cascading dropdown list on postback

'The button that launces the code, this is in the code behind
Public Sub saveProfilePeriod_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles saveProfilePeriodBtn.Click
        Dim CP As New CarProfile
        CP.ContractPeriodID = makeListExtender.SelectedValue
 
        CP.Deposit = carDeposit.Text
        CP.Ongoing = carOngoing.Text
 
        DB.CarProfiles.InsertOnSubmit(CP)
        DB.SubmitChanges()
        newContractPeriodContainer.Update()
 
    End Sub
 
This is the update panel with the cascading drop down in where I can not get the posted value
<asp:UpdatePanel ID="newContractPeriodContainer" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true">
                    <ContentTemplate>
                    <table class="formTable">
                        <tr>
                            <th>Contract Period: </th>
                            <td><div id="contractDropContainer">
                                    <asp:DropDownList ID="ContractPeriodsDrop" runat="server" />
                                    <cc1:CascadingDropDown ID="contractPeriodExtender" runat="server" />
                            </td>
                            <td><a href="javascript: hideContainer('newContractPeriod')">Add new contract period</a></td>
                        </tr>
                        <tr id="newContractPeriod" style="display:none">
                            <td></td>
                            <td>
                                <asp:TextBox ID="contractPerdiodText" runat="server" class="formSmallTextBox" /> months&nbsp;
                                <asp:button CssClass="btnSave" ID="saveContractPeriod" runat="server" OnClick="saveContractPeriod_Click" Text=" " />
                            </td>
                            <td></td>
                        </tr>
                        </table>
                    
                <table class="formTable">
                    <tr>
                        <th>Profile: </th>
                        <td><div id="profileDropContainer">
                                <asp:DropDownList ID="profilesList" runat="server">
                                
                                </asp:DropDownList>
                                <cc1:CascadingDropDown ID="profileListExtender" ServicePath="~/AdminEventHandlers.asmx" 
                                    ServiceMethod="GetCarProfiles" ParentControlID="ContractPeriodsDrop" TargetControlID="profilesList" PromptText="Select Profile" 
                                    runat="server" Category="Profiles"></cc1:CascadingDropDown>
                            </div>
                        </td>
                        <td><a href="javascript: hideContainer('addProfileContainer')">Add new profile</a></td>
                    </tr>
                    <tr id="addProfileContainer" style="display:none">
                        <td></td>
                        <td>
                            <asp:TextBox ID="carDeposit" runat="server" class="formSmallTextBox" />+
                            <asp:TextBox ID="carOngoing" runat="server" class="formSmallTextBox" />
                            <asp:button CssClass="btnSave" ID="saveProfilePeriodBtn" runat="server" OnClick="saveProfilePeriod_Click" Text=" " />
                        </td>
                        <td></td>
                    </tr>
                </table>
                </ContentTemplate>   
                    <Triggers>
                        <asp:AsyncPostBackTrigger ControlID="saveContractPeriod" />
                        <asp:AsyncPostBackTrigger ControlID="saveProfilePeriodBtn" />
                    </Triggers>     
                </asp:UpdatePanel>
 
'This is the page init where the cascading drop down is loaded, this works from a webservice
 Private Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
 
            contractPeriodExtender.ServicePath = "~/AdminEventHandlers.asmx"
            contractPeriodExtender.TargetControlID = "ContractPeriodsDrop"
            contractPeriodExtender.PromptText = "Select Contract Period"
            contractPeriodExtender.Category = "ContractPeriods"
            contractPeriodExtender.ServiceMethod = "GetContractPeriods"
 
 
    End Sub

                                  

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