public WebElement getHeaderWebElement() {
        return findElement(By.tagName("table")).findElement(By.tagName("thead"));
    }
Gets the Cell at the row/column coordinates.

@param rowIndex the index of the row
@param colIndex the index of the column in the row
@return the {@link Cell} representing these coordinates
@throws IndexOutOfBoundsException if either row or column not found
primefaces-selenium/primefaces-selenium-components/src/main/java/org/primefaces/selenium/component/base/AbstractTable.java