$cfield in Studio 4

[Das Goravani]

I am trying to do a type ahead feature on a certain field in Studio 4 on Windows

So that when they type, a list filter is activated.

On the field, which has $keyEvents enabled, as they type, it is trapped in $event on that field

On evKey
   Process event and continue
   Calculate myVar as $cfield.$contents

If I check myVar after typing a character I get NULL
If I use the name of the field instead I get NULL

I am used to this working, like in 10.2

Any ideas?