Why row focus(dotted box) missed?

[codexyz]

keyboard left, right key -> horizonScroll Control

i customized pqgrid PRO...

_pKeyNav._bodyKeyPressDown = function(evt) {

....

if (evt.keyCode == keyCodes.LEFT) {
   var decr = 0;

   if (SM.type == "row" && $(that.$hscroll)[0].style.display != 'none') {
      $(that.$hscroll).children('.left-btn').trigger('click');
      decr = 1;
   }
        var obj = this._decrIndx(rowIndxPage, colIndx);
   if (obj) {
      rowIndx = obj.rowIndxPage + offset + decr;
      this.select({
         rowIndx: rowIndx,
         colIndx: obj.colIndx,
         evt: evt
      })
   }
   evt.preventDefault();
   return
} else {
        if (evt.keyCode == keyCodes.RIGHT) {
      var incr = 0;
     
      if (SM.type == "row" && $(that.$hscroll)[0].style.display != 'none') {
         $(that.$hscroll).children('.right-btn').trigger('click');
         incr = -1;
      }
           
      var obj = this._incrIndx(rowIndxPage, colIndx);
      if (obj) {
         rowIndx = obj.rowIndxPage + offset + incr;
               
         this.select({
            rowIndx: rowIndx,
            colIndx: obj.colIndx,
            evt: evt
         })
      }
      evt.preventDefault();
      return
   } else {
       
        .....

}

......

keyboard left, right key -> horizonScroll Control very Well.

but, row focus(dotted box) missed.... T.T