To view the original and result animation when editing curves
A gray curve representing the current curve appears in the graph view.
You can also pin channels so that their curves always display in the graph view, regardless of what is selected.
To pin and unpin channels in the graph view
 ) or Unpin (
) or Unpin ( ) icons that display next to each channel name.
) icons that display next to each channel name. 
                     See also Pin Channel and Unpin Channel.