function(rx, tr){
        // Empty
        if (this.rowCount === 0)
          this.$el.oj(tr)

        // Last
        else if (rx === this.rowCount)
          this.$tr(rx - 1).ojAfter(tr)

        // Not last
        else
          this.$tr(rx).ojBefore(tr)

        this.bodyChanged()
      }
function(rx, tr){
        
        if (this.rowCount === 0)
          this.$el.oj(tr)

        
        else if (rx === this.rowCount)
          this.$tr(rx - 1).ojAfter(tr)

        
        else
          this.$tr(rx).ojBefore(tr)

        this.bodyChanged()
      }
function ( rx , tr ) { // Empty if ( this . rowCount === 0 ) this . $el . oj ( tr ) // Last else if ( rx === this . rowCount ) this . $tr ( rx - 1 ) . ojAfter ( tr ) // Not last else this . $tr ( rx ) . ojBefore ( tr ) this . bodyChanged ( ) }
_addRowTR: Helper to add row directly with `<tr>`
_addRowTR : Helper to add row directly with <tr >