Create a Highlight Effect

By default, the rectangle tool will create a box as seen in this example.

Select the rectangle and double-click. The inspector palette will open.

These are the default settings for the rectangle tool. With just a slight modification we can turn this into a highlight.

For this effect I have:

1. Unchecked the border to turn it off.
2. Checked the fill property.
3. Decreased the opacity of the fill.

You can see the result in the image (4).