Data Island with Checkbox

I am looking for how to set the "checked" value for a checkbox in the cell of a table that is in a table bound to an XML Data island.

I've been able to set other controls in the table (such as a text box and an anchor) using "datafld", but they are simpler. The checkbox has both a "value" property and a "checked" property. How do I link the "checked" property (not the value property) to a field in the XML data island?

Thanks...