There are a few things that you need to do before you start drawing menus. When a program draws graphics, it outputs them in the graph part of the interface. First, you need to get rid of anything that was previously drawn there. This is done by the command of ClrDraw. This is accessed by pressing [2nd] [DRAW] [Enter]. If you want the default window size to be -10, 10, -10, 10, then do the command of ZStandard. This sets the window size on the graph screen to it's default size. This is best to use, because most people's calculators have this already set. It is accessed by pressing [ZOOM] [6]. If you want to set the window to something else, press [VARS] [Enter], and store numbers to the different window variables. Sometimes, people will have equations entered into the Y= area of the calculator. It has to redraw these equations every time you enter something into the graph area, and they clutter your menus, so it is best to get rid of them. Tell the program to delete the variable DelVar is accessed from the catalog. The Y1, Y2, etc. variables are accessed by [VARS] [Right Arrow] [Enter].
Finally, you will need to take the X and Y axes off of the screen if you are doing menus, etc. You can do this by pressing [2ND] [ZOOM], and scrolling down to AxesOff. You should now be ready to begin drawing.