Open gridview inside another gridview
<p>I have a gridview which contains columns <code>vacancy id</code> and  <code>vacancy title</code> and a few image buttons. </p>

<p>When the user clicks on button <kbd>show criteria</kbd>, another gridview should open inside existing gridview.</p>

<p>This inner gridview should show criteria for that vacancy. </p>

<p>Again, when user clicks on the same button, it should hide the child gridview. </p>

<p>I tried this by adding child gridview in item template part of the template field of the parent gridview, but it shows the inner gridview in another column.</p>

<p>However, I want to open child grid below the row whose button is clicked. </p>

<p>How is this accomplished?</p>
