This demo illustrates the style concept of XtraReports.
You're able to create appearance styles for any of the report controls, and then apply it to the control when it's painted. Note that a style can either be always applied to a control, or applied only to odd or even data rows when the control is printed.
Look at the odd and even table rows in this report which illustrates this concept. Odd rows are painted with a Light Blue background, while even rows are painted with a White background.