src/internal.js
function appendRow(row)
{
    var that = this;

    function exists(item)
    {
        return that.identifier && item[that.identifier] === row[that.identifier];
    }

    if (!this.rows.contains(exists))
    {
        this.rows.push(row);
        return true;
    }

    return false;
}
function appendRow(row)
{
    var that = this;

    function exists(item)
    {
        return that.identifier && item[that.identifier] === row[that.identifier];
    }

    if (!this.rows.contains(exists))
    {
        this.rows.push(row);
        return true;
    }

    return false;
}
GRID INTERNAL FUNCTIONS =====================