Accessing value in marked row of a repeater from outside


I have a table. Clicking on a row I mark the row as marked (via mark rows). Now I have a button outside of the repeater. When clicking on it I want to get the value of the second column of the marked row. The value will be shown as text of the button. Attached an example.
Any ideas?
POC Select from Repeater.rp (65.3 KB)


POC Select from Repeater Listener@Jorkin.rp (68.5 KB)