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Set Checkbox.checked on modalpopup

Posted By:      Posted Date: October 12, 2010    Points: 0   Category :ASP.Net
I'm having trouble setting the checkbox.checked on a modalpopup. setting textbox.text is no problem.
Hop somebody can help me.
 <asp:Panel ID="pnlAddChild" runat="server" CssClass="Back_ModalPopup" style="display:none" Width="250" Height="350">
            <h1 class="Back_bodycontent">Add Child</h1>       
            <asp:Label ID="lblAddLabelNL" Text="Label:" runat="server" Width="50px"/>
            <asp:Textbox ID="tbAddLabelNL" runat="server" />            
            <br />
            <asp:Label ID="lblAddLinkNL" Text="Link:" runat="server" Width="50px"/>
            <asp:Textbox ID="tbAddLinkNL" runat="server" Text="http://" />
          <br />
            <asp:Label ID="lblActive" Text="Actief:" runat="server" Width="50px"/>
            <asp:PlaceHolder ID="phCHNL" runat="server" />            

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