InstantiateIn method of server control doesn't get fired

Question

Hi,

I have the following situation:

Server Control A:

<my:ServerCtrlA ...>
   <Content>
      <my:ServerCtrlB .../>
   </Content>
</my:ServerCtrlA>

The <Content> property of ServerControlA is an ITemplate on which I call the InstantiateIn(...) method.

ServerCtrlB is another control that may possibly be placed inside this Content property in the aspx code. The ServerCtrlB wraps a Repeater control inside with the appropriate templates for the header, footer and the items.

Now my problem is that strangely when I place the ServerCtrlB inside my Content property of the ServerCtrlA, the InstantiateIn of the template inside ServerCtrlB doesn't get called on a GET request of the page, but just when doing a POST request (i.e. hitting a button somewhere or similar). On the other side if I put just the ServerCtrlB control on a page everything works fine on both, GETs and POSTs.

Does someone have a hint on what could be the problem here??