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Basics
When a breakpoint is set, the editor displays a breakpoint icon in the gutter area to the left of the affected source code. A breakpoint icon denotes status of a breakpoint, and provides useful information about its type, location, and action.
The icons serve as convenient shortcuts for managing breakpoints. Clicking an icon removes the breakpoint. Successive use of Alt - click on an icon toggles its state between enabled and disabled. The settings of a breakpoint are shown in a tooltip when a mouse pointer hovers over a breakpoint icon in the gutter area of the editor.
Breakpoint states and icons
The table below summarizes the possible breakpoint states:
| Status | Line JavaScript Flex | Temporary Line | Exception | Method | Field | Description |
|---|---|---|---|---|---|---|
| Enabled |  |  |  |  |  | Shown at design-time or during the debugging session when the class with such breakpoint is not yet loaded. |
| Valid |  | N/A | N/A |  |  | Shown at run-time when the breakpoint is recognized by the debugger as set on an executable code line. |
| Invalid |  | | N/A |  |  | Shown when the breakpoint is set on a commented or non-executable line indicating that such breakpoint would not be hit. |
| Disabled |  | |  |  |  | Indicates that nothing happens when the breakpoint is hit. |
| Conditionally disabled |  | |  |  |  | This state is assigned to breakpoints when they depend on another breakpoint to be activated. |
When the button 
is pressed in the toolbar of the
Debug tool window, all the breakpoints in a project are muted, and their
icons become grey: 
.