Panel set to hidden and then visible loses textbox values
<p>I hope I can explain this properly.</p>

<p>I have a grid that is part of our 3rd party shopping cart software.  This grid has a row of quantity text boxes into which the customer enters how many of each thing they want to buy.</p>

<p>I put this grid inside a panel so I can set it on or off with</p>

<pre><code>myPanel.Visible=true;
</code></pre>

<p>I also have a button to show and one to hide using the above code method.  </p>

<p>If I enter a value into a textbox and then click the hide button and then click the show button, when the panel reappears the values are zero.  If I then reload the page (browser reload) then the value returns as it was originally.  It's a pretty good magic trick but not what I need.  What am I doing wrong?</p>

<p>Eventually I want to select a date from a calendar while it is hidden but that is not in play yet... just the show/hide buttons. </p>

<p>Thanks</p>
