Turn on Easy Trace Creation
To invoke the easy trace creator for a trace,
- Double click on a trace
- Press "z" and the Easy Trace Creation/Edit window will pop up

- Click on the "Save as Standard Trace" box if you want to save your changes as a Standard Trace.
- Click on the "Display this window when starting new measurements" box if you want the Easy Trace Creation window to pop up each time you double click on the trace to measure.