This has happened to me on a number of occasions, and is extremely inefficient. I was in the process of sketching a polygon, when instead of right click and hitting "finish part" I accidentally hit "finish sketch." When I undo, the entire sketch is deleted, I am not put back into sketching mode. How can I get back to sketching, or is there some tool similar to reshape feature, or edit verticies, that will allow me to modify my sketch? I realize I could make a new shapefile, and use geoprocessing, clip to achieve the same effect, but that seems like a lot of additional work to do something that must already be built in.