How to set width to INDEX column

If a table is set to be RowHeaderMode.INDEX, an index column will be displayed as the first column in the table:
table.setRowHeaderMode(Table.RowHeaderMode.INDEX);

My question is how to set its width? or is there default name for INDEX column?

I have to ask the question once again, does anyone meet the same requirement?

In addition, one of my client also wants to put a checkbox column before the index column, can vaddin do that?