function getAriaDescribedBy(oAuto, bIncludeInfo){
		var aDescBy = oAuto.getAriaDescribedBy();
		var sDescBy = "";
		for (var i = 0; i < aDescBy.length; i++) {
			sDescBy += aDescBy[i];
			if (i < aDescBy.length - 1) {
				sDescBy += " ";
			}
		}

		if (bIncludeInfo) {
			sDescBy += " " + oAuto.getId() + "-ariaLbl";
		}

		return sDescBy;
	}
Sets a custom filter function for items. Default is to check whether the item text begins with the typed value.

Example:
<code>
function(sValue, oItem){
	  return jQuery.sap.startsWithIgnoreCase(oItem.getText(), sValue);
}
</code>

@param {function} [fFilter] The filter function. If not set the default filter function will be used.
@public