SMART datagrid v.1 > Classes > RowGroup
Style Set which is used when drawing empty area displayed on the left side of data rows after row grouping.
Currently, GridStyles.background, borderRight, borderBottom styles are being used.
grid.rowGroup().setIndentStyle({
background: "#10aaaa0",
borderRight: "#20aaaa00",
borderBottom: "#20aaaa00
});