Adding programatically created controls as triggers for updatepanel.

Hi!
I've been trying and I've been reading but I cannot make this thing work... Adding programmatically created controls as triggers for my updatepanel, sigh.

I have 2 repeaters that creates Headlines and Checkboxes that will later filter out a gridview.
The gridview is within a updatepanel, the repeaters are not.
The checkboxes are created based on data from my database.
The checkboxes CheckedChanged events are fired and the filtering begins.
Works great.

Now I want the gridview to update through a AsyncPostBack.
I've tried added this to both Checkbox_Init and repeater_ItemDataBound
        AsyncPostBackTrigger trigger = new AsyncPostBackTrigger();
        trigger.ControlID = checkBox.UniqueID;
        updGv.Triggers.Add(trigger);

and I've tried this on both locations:
        ScriptManager1.RegisterAsyncPostBackControl(checkBox);

I have been reading and apparently you have to use the ScriptManager1.RegisterAsyncPostBackControl method to make this work but it just wont.

Any ideas?

Thanks for any help...
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