.GridviewScrollHeader TH, .GridviewScrollHeader TD
{
    padding: 5px;
    font-weight: bold;
    white-space: nowrap;
    border-right: 1px solid #AAAAAA;
    border-bottom: 1px solid #AAAAAA;
    background-color: #EFEFEF;
    vertical-align: bottom;
    text-align: left;
}

.tCentrado TH, .tCentrado TD
{
    text-align: center;
    padding-right:0;
}