How to create a themed server or composite control

The idea here is that I have a themed asp:Table that I constantly use that really needs to be a server or composite control.  I'm not sure which is needed for my case, but any help would be much appreciated it.  I want this controls to be able to contain any child controls I want: labels, textboxes, radio buttons, panels, etc. At render I would then "wrap" these child controls with my themed asp:Table.
My themed asp:Table looks like:
<asp:Table ID="myBox" SkinID="Common_Box" runat="server" Width="400px"> <asp:TableRow> <asp:TableCell SkinID="Common_Box_Corner_TopLeft" runat="server" /> <asp:TableCell SkinID="Common_Box_Edge_Top" runat="server" /> <asp:TableCell SkinID="Common_Box_Corner_TopRight" runat="server" /> </asp:TableRow> <asp:TableRow> <asp:TableCe ...