EPDM Search Card Filter Workflow States

Our EPDM search card gives the user the option to search by workflow and workflow state.  It seems intuitive that the user should be able to first choose the workflow from a drop down list (I can make this work) and then choose the workflow state from the next drop down list that is limited to just the states in the workflow previously chosen.  I am not able to make this work - this drop downbox will only list all of the workflow states, which is undesirable in our case since we have a migration workflow that includes states Set Rev A to Set Rev ZZ.  Any ideas other than maintaining separate card lists?

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