How to zero the Show Location window without deselecting the tool in use.
1. Select the Show Location option in the preference menu.
2. Set the Show Location Window to the relative state by clicking in the Show Location Window.
3. Hold the option key down while clicking on any point in the drawing.
4. The data in the Show Location Window (relative state) will change to zero. The distance the mouse is moved from this point on will be displayed in the Show Location Window.
