Graphs
The Graphs window displays the Betfair style price graph of the selection you currently have your mouse over. As you move from selection to selection with your mouse, the displayed graph changes.

Menu Options
By right clicking on the header of the window the following menu options are displayed:

Auto Refresh - allows you to alter how often the graph refreshes Inverse Axis - this can also be achieved by double clicking on the graph and displays the Betfair % of probability chart instead