SMART datagrid v.1 > Classes > RowGroup
The size of space which is left empty on the left area by each level when the grouping is not Merge Mode.
It specifies in pixels. The size of area is determined by the greater value between the value specified in minHeaderIndent and this value.
Defaults to 20.
grid.setOptions({
rowGroup: {
levelIndent: 16
}
};