title: How does one expand/collapse a nested GridView embedded within div element while clicking an ImageButton?
body: <p>For the following code</p>
  
  <pre><code>&lt;asp:GridView runat="server" ID="gvCustomers" ...
  ...
   &lt;Columns&gt;
     &lt;asp:TemplateField&gt;
       &lt;HeaderTemplate&gt;
       &lt;/HeaderTemplate&gt;
       &lt;ItemTemplate&gt;
         &lt;asp:ImageButton runat="server" ID="ITimgExpand" ImageUrl="~/Images/Common/expand.gif" CommandName="Select" /&gt;
       &lt;/ItemTemplate&gt;
     &lt;/asp:TemplateField&gt;
     ...
     &lt;asp:TemplateField&gt;
       &lt;ItemTemplate&gt;
        &lt;/td&gt;&lt;/tr&gt;
          &lt;tr&gt;
             &lt;td colspan="3"&gt;
                &lt;div id="document_&lt;%# Eval("RENTER_ID") %&gt;" style="margin:10; display: none; position: relative"&gt;
                    &lt;asp:GridView ID="gvDocuments" runat="server" ...
                    ...  
  </code></pre>
  
  <p>How does one expand/collapse div which includes nested GridView while clicking ITimgExpand ImageButton?</p>