reading textbox value from user control in ajax modal popup extnder

Parent .aspx Form has 5 buttons. Each opens a ajax modal pop-up extender containing a user control (.uscx).
The uscx is registered, all works well.

Button opening  the modal is  below. The 5 buttons are in sequence  BtnDims1, BtnDims2  etc.  So are all the ID's


 
<asp:Button ID="BtnDims1" runat="server" Text="Dim" Width="31px" Font-Size="XX-Small" ToolTip="Enter Dimensional Load Information" TabIndex="11" />
                        <ajax:ModalPopupExtender ID="BtnDims1_Mpe" runat="server"  Enabled="True" TargetControlID="BtnDims1" PopupControlID="PNLfgtDimension1"   DropShadow="true">
                        </ajax:ModalPopupExtender>
                       <asp:Panel ID="PNLfgtDimension1"  style="display:none;"   runat="server" BorderColor="#212020" BorderStyle="Double" Visible="true" BorderWidth="6px" Width="440px" Height="150px" BackColor="White">
                        <uc1:FgtDemensions runat="server" ID="FgtDimensions1" />
                      </asp:Panel>

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The user control has 3 text boxes (TBlength, TBWidth & TBHeight) and one cmd buttom.

After client enters the 3 values  they click the save button, things are saved and the modal closes.  
Now I want to be able to read the values from those text boxes from the parent page.(I know the inputs are still there because when I click on the modal popup button again the inputs still display.)

I can find the main child controls (the panels and forms)  in the control collection but can not successfully get the values from the text boxes.  
I found the user control using this code.
MyModal1 = CType(FindControl("BtnDims1_Mpe"), AjaxControlToolkit.ModalPopupExtender)
Dim fgtcontrol As UserControl = CType(MyModal1.FindControl("FgtDemensions1"), UserControl)

Can someone show me how to read the textboxes?     I know hoe to send vales from a child.
Not having any success at reading (pulling) from a child.

Thanks!
ash691Asked:
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Ron MalmsteadInformation Services ManagerCommented:
You can save it in the session when they click submit.

Session("height") = btnDims.text

.. Then read the value back on the main form.  Make sure you clear the values after using them.

Dim theheight as string = Session("height")
Session("height") = ""
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Ramkisan JagtapLead DeveloperCommented:
If you use the developer tool in the browser you can track the hierarchy of the controls in your modal popup.
then you can try finding them using .FindControl(). But it will be bit complex.

Best way is to store that values in session or in the viewstate.
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leakim971PluritechnicianCommented:
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery-cookie/1.4.1/jquery.cookie.js"></script>

attach an event to your button in your modal popup :

$("#<%= Close.ClientID %>").click(function() {
      $.cookie("TextBox1inModal", $("#<%= TextBox1.ClientID").val() );
      $.cookie("TextBox2inModal", $("#<%= TextBox2.ClientID").val() );
});

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Now in your parent page, you can read teh value by reading the cookies :
$.cookie("TextBox1inModal");
and :
$.cookie("TextBox2inModal");
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