code: public JComponent createButtonBar(final Size minimumButtonSize, final Border border) {
  		return createButtonBar(minimumButtonSize == null ? null : new ColumnSpec(minimumButtonSize), null, border);
  	}
docs: Create a button bar with buttons for all the commands in this.
  
  @param minimumButtonSize if null, then there is no minimum size
  @param border if null, then don't use a border
  
  @return never null