title: WPF Listbox - change itemsource of control in datatemplate
body: <p>I have a listbox with a datatemplate that holds a number of controls bound to my collection.</p>
  
  <p>What i want is to change the itemsource for one of these comboboxes dependant upon the value selected in one of the other comboboxes in the same row. I don't want to change the itemsource for all corresponding comboboxes within the rest of the rows in the listbox.</p>
  
  <p>How do I get a handle on the control in the selected row only. </p>
  
  <p>Is this something that is easier to try doing witht the WPF datagrid?</p>
  
  <p>Thanks.</p>