code: public JComponent createButtonStack(final ColumnSpec columnSpec, final RowSpec rowSpec) {
  		return createButtonStack(columnSpec, rowSpec, null);
  	}
docs: Create a button stack with buttons for all the commands.
  
  @param columnSpec Custom columnSpec for the stack, can be
  <code>null</code>.
  @param rowSpec Custom rowspec for each row containing a button can be
  <code>null</code>.
  @return never null