See this link :
http://zone.ni.com/devzone/devzoneweb.nsf/opendoc?openagent&BF06AE16FD85ECD58625683A000A66E4&cat=01DA3ED38B8928E1862567AC0057F0AD
It uses a slider with 3 positions only. Then you read the numerical value (0,1 or 2) to indicate which state the switch is in.
Jared