Maybe I worded my problem wrong. In the sketch mode I have a square and want equal radii on the four corners. Now I use the create a circular fillet between two entities command and pick the coresponding lines at each corner. And then use create equal radius command and pick each radius.
OK, how about creating a circle that would be tangent to both lines in the corner and then let the intent manager take over when you create three other circles in the rest of the corners. You would then have to do trimming, but that's one way.