dependon certain value of an option

  Hi all,

I came across an option that depends on a certain value of a required 
option. For example:

option    "method"    m    "Method used"    int    values="1","2","3"    
default="1"    required
option    "distance"    d    "Distance to be used for method 2"    
int    dependon="method"

Basically option d needed only if method used is 2.

Is there any way of doing this?

Thanks so much,

D.