Stair by Linework

This tool create stairs from a set of lines / polylines / arcs / curves.
To create the stairs:

1. Select the tool
2. Open the Selection Info palette, and set the Riser height. Using this pattern as an example:
3. Select 2D polyline/circular arc for the Stair's Linework Left side path (1) Note: the selection of the right/left side define the direction of the stairs.
4. Select 2D polyline/circular arc for the Stair's Linework right side path (2) 
5. Select 2D polyline/circular arc for the Stair's Linework path (3) 
6. Select 2D polyline/circular arc for the Stair's Linework Tread's Riser path (4-10) Note: it is important to select the riser in sequence from first to last in order to get predictable results.
7. After you have chosen two risers you will be prompted to Select 2D polyline/circular arc for the Stair's Linework Tread's Riser path or use "Finish" from local menu to create stair.  Click Finish in the local menu or Inspector bar to complete the stair.

Note: at anytime in steps 3-6 you can opt to use One Step Back from the local menus or Inspector bar.