Setting or Unsetting Breakpoints

To set or unset a breakpoint while in the debugger

The selected line of code is then highlighted in yellow when a breakpoint is set (or the selected color of your choice).

You can also toggle a breakpoint in a line of logic selected in the editor pane of the Class Browser or Primitive Types Browser, by clicking the Browser toolbar Toggle Breakpoint button, selecting the Toggle Breakpoint command from the Methods menu, or pressing F5.