code: public void setTable(final Table table) {
          if (table != _tableRef.get()) {
              _tableRef.set(table);
  
              if (table == null) {
                  _comboBox.setEmptyModel();
              } else {
                  _comboBox.setModel(table);
              }
          }
      }
docs: Sets the table to use as a source for the available columns in the
  combobox.
  
  @param table