extjs4 - ExtJs rownumberer issue -

i using extjs gird displaying data db. using { text: 'no.', xtype: 'rownumberer' } number rows. fine except rownumberer not working expected in google chrome. if have 140 records, rownumberer working fine till 99th record , after rows displays dots (...). know why happening?

seems column gets to small, when row number needs 3 digits. not reproduce in grid, see numbers clipped, not better. suggest set width of column fixed value:

{ text: 'no.', xtype: 'rownumberer', width: 50 }