How do I make a custom ASP.NET control based/subclassed on an existing one?
<p>I want to make a custom ASP.NET control that is a subclasse of <code>System.Web.UI.WebControls.Calendar</code>. I need it to add a few data members and set up a few event handlers in it's constructor.</p>

<p>Is this possible? If so How?</p>

<p>So far I have tried using <em>add new item</em> to add a default <em>web user control</em> and tried editing in <code>Calendar</code> in a few different places. None have worked so far.</p>

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<p>Edit: it seems I'm totally missing how this stuff is supposed to work. 
Does anyone known of a demo project that I can look at? Something that already exists. (Unless you are really board, don't go out and make one for me.)</p>
