-  Go to Setup/Users
-  Click on the 'Add' 
icon
-  Fill in all the fields and make sure that 
the 'passwd' field and the 'confirm passwd' fields don't 
match
 
Result:   
The 'Add' and 'OK' icons become disabled.  It's unclear to the user as to 
why those fields are disabled.  There needs to be an error msg of some 
sort.