Bind Object to WPF TreeView

Programmer Question

I would like to know how to bind a custom datatype to a treeview.

The datatype is basically arraylists of objects that contain other arraylists. Access to would look something like this.

foreach (DeviceGroup dg in system.deviceGroups)
    {
        foreach (DeviceType dt in dg.deviceTypes)
        {
            foreach (DeviceInstance di in dt.deviceInstances)
            {

            }
        }
    }

I would like the treeview to look something like this:

DeviceGroup1

 --> DeviceType1
      --DeviceInstance1
      --DeviceInstance2
 --> DeviceType2
      --DeviceInstance1

DeviceGroup2

 --> DeviceType1
      --DeviceInstance1
 --> DeviceType2

Find the answer here