Expression to get the key field instead of display field?

isstabb

I just need the appropriate syntax to retrieve the key instead of the display for a level of a dimension. In other words, these both reflect the display value:

dimension["MyGroup"]["MyLevel"]
dimension["MyGroup"]["MyLevel"]["DisplayValue"]

How do I get to the key? I tried things like:

dimension["MyGroup"]["MyLevel"]["Key"]
dimension["MyGroup"]["MyLevel"]["KeyValue"]
dimension["MyGroup"]["MyLevel"]["<KeyColumnName>"]
etc

to no avail. I'm trying to filter the crosstab by a known key.

isstabb

Hmm, turns out dimension["MyGroup"]["MyLevel"] is the key....when sorting. I'm only having trouble with this with filtering.