title: WPF Drill-down GridView to display live data
body: <p>I'm writing a monitoring system that displays real-time sensor data.</p>
  
  <p>The sensors are arranged in a hierarchy. Sensor 1 could, for instance, have S1.1 and S1.2 as children, which could in-turn have S1.1.1, S1.2.1, and so forth.</p>
  
  <p>I'm looking for a GridView control that allows one to drill-down each parent item, while still refreshing the values in the grid with the live data.</p>
  
  <p>It would obviously not be that hard to write such a component oneself, but would rather buy something than spend a week creating such a control. </p>