SfDataGrid allows you to apply different styles for the top and bottom table summaries by using the SfDataGrid.TableSummaryCellStyle property. You can apply some conditional based styling for each summary columns using converter like below code example.
Universal Windows will not support IValueConverter in styling, but you can achieve the above requirement using StyleSelector like the below code example.
The following screenshot displaying the TableSummaryCell Style.
This page will automatically be redirected to the sign-in page in 10 seconds.