Cisco WAN :: 12416 Configure Static Route Load Balancing

I got an issue when configure my 12416 router.
    
I plan to configure Static route load-balancing, which just assign different administraive distance to static routes.The route with lower distance is preferred. For example, if ISP A is our primary Internet provider the default  route may be configured with a distance of 1 (all static routes are assigned this administrative distance) and the default route through ISP B may be configured with a distance of 100. In that case the default route through ISP B will be used if only the route through ISP A becomes unavailable.

But when I trying to configureWith Enhanced Object Tracking  to do the route failover (a generic track object can monitor presence of an ip route, state of an SLA), I found my IOS not support such Track command. [code]