code: function cssSizeToPx(sCssSize) {
  		if (sCssSize === 0 || sCssSize === "0") {
  			return 0;
  		}
  
  		var aMatch = sCssSize.match(/^(\d+(\.\d+)?)(px|rem)$/),
  			iValue;
  		if (aMatch) {
  			if (aMatch[3] === "px") {
  				iValue = parseFloat(aMatch[1]);
  			} else {
  				iValue = Rem.toPx(parseFloat(aMatch[1]));
  			}
  		} else {
  			Log.error("Css size '" + sCssSize + "' is not supported for GridContainer. Only 'px' and 'rem' are supported.");
  			iValue = NaN;
  		}
  
  		return Math.ceil(iValue);
  	}
docs: Converts the given css size to its corresponding 'px' value.
  @private
  @param {string} sCssSize The css size to parse. For example '5rem'.
  @returns {int} The size in 'px'. The result is rounded up with Math.ceil(). Returns NaN if the size can not be parsed.