/** * add a URL parameter (optionally defined per row) to this column's URL. * * @param {string} param the name of a parameter to add to URL * @param {string} value the value of the parameter to add to URL -or- a column in the datasource that returns the parameter value for each row * @param {boolean} [perRow] if true then the 2nd arg is expected to be a column in the datasource * * @method * @memberOf nlobjColumn * * @since 2008.2 */