# Mouse.onMouseDown

#### Availability

Flash Player 6.

#### Usage

    someListener.onMouseDown

#### Description

Listener; notified when the mouse is pressed. To use the `onMouseDown` listener, you must create a listener object. You can then define a function for `onMouseDown` and use the `addListener` method to register the listener with the Mouse object, as in the following code:

    someListener = new Object();
    someListener.onMouseDown = function () { ... };
    Mouse.addListener(someListener);

Listeners enable different pieces of code to cooperate because multiple listeners can receive notification about a single event.

#### See also

`Mouse.addListener()`