Panel Enabled property not propagated
<p>I am working on an ASP .Net web application in my company.<br>
The application contains a composite user control made up of a checkbox, several panels and other controls.  </p>

<p>One panel contains severals child controls and especially a custom server control.<br>
The custom server control inherits from TextBox.  </p>

<p>A handler is executed when the checkbox is checked or unchecked.<br>
A statement in the handler set the Enabled property of the panel to false.<br>
But the Enabled property of the custom server control is equal to true at PreRender.<br>
Why ?</p>
