How to customized PagedTable addon

Hello all … I am new to vaadin!addon/pagedtable

I am using the above addon. When i using this addon it working fine. if i select 5 or 10 or 25 etc the table is automaticaly showing the 5 or 10 or 25 rows accordingly but the number what i select 5 or 10 or 25 is not displaying in the drop down box. Screen shot is given for your reference. how come i can fix this. please help me to fix this.