The best way to create one is to manually draw a rectangle or symbol in the header or footer pane, copy and paste until you have the correct number, fill them with the fill patterns/colors, and then draw text next to them with the appropriate text contents.
Using the Arrange | Align Objects commands help with lining up the text, rectangles, and symbols.
Strater 2 through 4 can automatically create a legend for any of the schemes in the project by clicking the Draw | Legend command. In Strater 5 this command is Log | Add | Legend.
Updated: October 4, 2016