To set or unset a breakpoint while in the debugger
Position the caret on the appropriate line of code in the method source window and then perform one of the following actions.
Select the Toggle command from the Breakpoints menu
Click the Toggle Breakpoint toolbar button
Press F5
Press Ctrl+Alt+B
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.