protected void UpdateSpeciesColumn(TreeVM tree, DataGridViewComboBoxCell cell)
 {
     if (cell == null) { return; }
     cell.DataSource = tree.ReadValidTDVs();
 }
 public void UpdateSpeciesColumn(TreeVM tree)
 {
     if (_speciesColumn != null)
     {
         _speciesColumn.DataSource = tree.ReadValidTDVs();
     }
 }