OBO-Edit: Tips
May 31st, 2007 - Rubber Band Selection in the Graph Editor
Middle-click and drag to create a selection "rubber-band". Any terms that are in the rubber-band box when you release the middle mouse button will be selected. If you hold down shift as you release the mouse button, all the terms in the box will invert their selection status, so selected terms will be unselected, and unselected terms will be selected.