How to control decimals in eSearch widget's datagrid?

[LeiZhou]

I want to keep 2 decimals for a variable in eSearch widget.  Can I use numberformat to control decimals? The following code only keep integer.  Thanks!

<field name="minor" alias="Percent Minority" numberformat="0|,|." gridfield="true"/>

[LeiZhou]

Thanks a lot!