Linear Pattern - mirrored features

I have a base plate I'm trying to perform a linear pattern on for a weldment frame.  This base plate has 4 holes.  I created one hole, and mirrored the other 3.

When I perform the Linear Pattern command, it works great, except for one thing.. It only copies my base plate with my original hole.. It doesn't copy my mirrored holes, even though I select them.

Any thoughts?

Thx

SolidworksParts And Features