C# custom web control

[bixby]

I'm building a custom navigation control for our website
developers and would like to allow our users to be able
to build the control in the html as such:
<td:navHeader>
<tab prop1="value" prop2="value">
<tab prop1="value" prop2="value">
</td:navHeader>

where navHeader is a WebControl that contains n Tabs,
another custom WebControl.

I'm new to controls though - how will the navHeader class
access the nested controls? They don't seem to be in the
navHeader's Control collection - is there something in
the navHeader class that needs to be set to accept nested
tags like this?

Any pointers are appreciated, thanks.