Cannot set a feature to a "MirrorPatternFeatureData" object

I am manipulating assembly pattern data.  The macro works well for local and derived patterns.  I would like to add a mirror components to the macro.

I have a feature that claims to be of a Mirror component type (swFeature.GetTypeName2 = "MIRRORCOMPFEAT")

Private Sub ProcessMirrorPatternDefinition(swFeature As Feature, swModel As ModelDoc2)

Dim mirrorDef As SldWorks.MirrorPatternFeatureData

Set mirrorDef = swFeature.GetDefinition  (this sets the mirrorDef to "nothing")

I have tried a number of types of mirror objects with no change.

All thoughts are appreciated - Dave

SolidworksApi/macros