Server controls inside a composite control do not fire events within control

With much pain i have created a custom control which renders the control with a decent look and feel. I could possibly handle that. But the matter of concern is that the server controls (i have many listbox to name one) are not invoking any events. I will explain more about the custom control. It is quite a simple custom control that inherits from CompositeControl and INamingContainer. The control has an button and an listbox server control. In the CreateChildControls method of the CustomControl - ImagePicker is its name, i have associtated the selectedindexchanged event on the listbox. The behaviour at runtime is weird. The page which hosts the CustomControl posts back successfully, but the event is never invoked. Note that the event handler is also inside the control itself. I am not talking about exposing the events to the external world which i know will require me to implement the interfaces IPostBackDataHandler and IPostBackEventHandler. I have infact implemented those interfaces just in case i understood it wrong, but it wont help.
Following is the code that i added in CreateChildControls method:

            listCategories = new ListBox();
            listCategories.Height = Unit.Pixel(120);
            listCategories.AutoPostBack = true;
            listCategories.BackColor = Color.Gray;
            listCategories.BorderStyle = BorderStyle.None;
            listCategories.BorderWidth = 0;
            listCategories.EnableViewState = true;
            listCategories.SelectedIndexChanged += new EventHandler(listCategories_SelectedIndexChanged);

The method listCategories_SelectedIndexChanged is never fired. Neither the SelectedIndex of the listbox gets changed.
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sudhijssConnect With a Mentor Author Commented:
Got it! Must have been a stupid mistake i guess. I was adding items to the list inside the RenderContents method. I moved that databinding code to the CreateChildControls and lo the event fires. I must ve not understood the page lifecycle appropriately. Thanks for offering help anyway.
Just go ahead and post all the code of your composite control, and all the code of the aspx page you are using this control in.  It is possible to do what you want without anything too fancy.
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