Hi, it's been quite some time since I've used a CAD program but another way you could do this is by using layers:
First set up some useful layers - Drawing, Circle and Auxiliary (use the 'Auxiliary layer for construction guides).
Next, working on layer 'Drawing' draw out the rectangle and hatch it how you want.
Next, working on layer 'Circle' draw two separate Circles.
Next, still working on layer 'Circle' fill one of the Circles with a White color fill.
*Note, the Filled Circle in the screen shot is Red because it has been selected (all entity selections are made Red!)
Next, change to work on layer 'Auxiliary' and draw a guide line, snapping between top and bottom centers of the rectangle.
Next, select and move the filled circle snapping to the center of the guideline.
Next, move the unfilled Circle into position in the same manner by snapping to the guideline.
Now turn off the Auxiliary layer, that should be it, hope it helps.
Chip
First set up some useful layers - Drawing, Circle and Auxiliary (use the 'Auxiliary layer for construction guides).
Next, working on layer 'Drawing' draw out the rectangle and hatch it how you want.
Next, working on layer 'Circle' draw two separate Circles.
Next, still working on layer 'Circle' fill one of the Circles with a White color fill.
*Note, the Filled Circle in the screen shot is Red because it has been selected (all entity selections are made Red!)
Next, change to work on layer 'Auxiliary' and draw a guide line, snapping between top and bottom centers of the rectangle.
Next, select and move the filled circle snapping to the center of the guideline.
Next, move the unfilled Circle into position in the same manner by snapping to the guideline.
Now turn off the Auxiliary layer, that should be it, hope it helps.
Chip