new ColumnChangeState(this);
// Return to the current state after processing.
columnChange.setNextState(currentState);
// Process the column change and return to its terminal state,
// which was set above.
currentState = columnChange.processEvent(event);
} else if (attrName.equals(FormatComposite.ROWS_ATTR_NAME)) {
// See the comment above for the "columns" attribute.
GridModifierState rowChange =
new RowChangeState(this);