- addRowBelow<T extends object>(    ds: Ds<T> | Dsm<T>,    source: T,    target?: {        changeSel?: boolean;        select?: Loc | "rows" | T;        useClone?: boolean;    },): { success: boolean } - Parameters- ds: Ds<T> | Dsm<T>
- source: T
- Optionaltarget: { changeSel?: boolean; select?: Loc | "rows" | T; useClone?: boolean }- OptionalchangeSel?: boolean
- Optionalselect?: Loc | "rows" | T
- OptionaluseClone?: boolean
 
 
- Returns { success: boolean }- 
- The result of the operation.
 
Adds a single new row below the selected row.