Summary Builder and Expand Rows

Smart GWT Technical Q&A
1

Hi

I am using smart GWT 2.3 and mozilla 3.0.15.

i am using summary builder and Expand rows for my ListGrid.
but since there is an expand row a new column is apperaing as the first column with expand/collapse icon.

But when i take summary builder a new filed Named A is comming as first row in the summary builder. which is having no value as description or field name.
how can i remove this column.

Thanks