I am trying to mirror a part in an assembly to create a left and right side case... when I mirror the left hand part, to create the right hand part... the sketches and planes of the new part seem to be flipped around (see image). I have tried all the different options but nothing seems to work. I just want to mirror the left side, to create the right side, then add unique features to the right side. The sketchs below the part are supposed to be on the part, and so are the planes.

Any ideas what I am doing wrong? Thanks!