Using repeater buttons as triggers for an external update panel

Hello experts! I have a question that might be very simple for all of you but has given me plenty of trouble.
I have a repeater with a given datasource, and inside that repeater I generate lots of products. Each product has a "add to shopping list" button, which is meant to Update an update panel located outside of my repeater (the repeater is _not_ inside of this update panel).

I tried giving my buttons dynamic ids but " ID='<%# Eval("ID_Projecto").ToString() %>' " gives me an error :( so I cant dynamically add them as triggers for the other update panel, since I can't find out which ID the repeater is generating for them.

So... if my repeater was called "rep", and my button was called "btn" and my other update panel was called "shopping_list", what should I be doing?

Thank you for your feedback in advance, this is quite urgent for me!
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vnobreConnect With a Mentor Author Commented:
The shopping_list.Update() didn't work but I found out a very easy way to make every repeater button work as a trigger for the update panel, all I had to do was declare the repeater as the trigger, as in:

<asp:UpdatePanel ID="shopping_list" runat="server" UpdateMode="Conditional">
<asp:AsyncPostBackTrigger ControlID="rep" />

Thank you again for your feedback!
on the btn click event call
shopping_list.Update(); and it should update the panel
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