function selectSuggestionItem(oSF, oEvent, iIndex, bRelative) {
		var index;
		if (suggestionsOn(oSF)) {
			index = oSF._oSuggest.setSelected(iIndex, bRelative);
			if (index >= 0) {
				oSF._updateValue(oSF.getSuggestionItems()[index].getSuggestionText());
			}
			oEvent.preventDefault();
		}
	}
Handle when Alt + UP arrow are pressed.

@param {jQuery.Event} oEvent The event object.
@private
@function