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Help creating design-time properties

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I've created 2 web controls MyControlParentClass, and MyControlChildClass
(both are direct WebControl descendents). MyControlParentClass has a
property of type MyControlChildClass. If I add a MyControlParentClass to a
web form, then add a few MyControlChildClass controls to the form as well, I
want to see a drop down list of the MyControlChildClass controls in the
property editor for my MyControlParentClass control. This part works fine,
but if I save my form then close and re-open it, the selected
MyControlChildClass has disappeared.

I've looked at all the examples I can find on MSDN and google (in particular But I
can't get this to work. At first I thought I'd need a TypeConverter
descendent to get the drop down list to even appear, but it seems to appear
without me doing anything with a TypeConverter. Maybe the TypeConverter is
what I need to implement to get the property to be persistent when I save my
web form?

I'm not trying to do anything fancy with the property. The
MyControlChildClass property of MyControlParentClass should simply show the
ID's of the available MyControlChildClass controls in the property editor at
design time. And of course setting the MyControlChildClass property at
runtime to the ID of a MyControlChildClass should set this property to an
instance of MyControlChildClass.

Thanks for any help,

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