Select the update icon to update the viewing, it should look
a lot like this.
This way you can work inter-actively by creating renderstyles and assigning them to layers to produce the results you want.
Remember that once you have worked up a set of renderstyles and a settings file, you can use that set up to process any number of cad files.
Next:
Create
a renderstyle to fill in the rectangle. which is actaully a closed
polyline object.