public void GetValue (Gtk.TreeIter iter, int col, ref GLib.Value val)
{
ITreeNode node = GetNode (iter);
val.Init (ctypes [col]);
object col_val;
if (getters [col] is PropertyInfo)
col_val = ((PropertyInfo) getters [col]).GetValue (node, null);
else
col_val = ((FieldInfo) getters [col]).GetValue (node);
val.Val = col_val;
}