# MovieClip.onMouseDown

#### Availability

Flash Player 6.

#### Usage

    my_mc.onMouseDown

#### Parameters

None.

#### Returns

Nothing.

#### Description

Event handler; invoked when the mouse button is pressed.

You must define a function that executes when the event is invoked.

#### Example

The following example defines a function for the `onMouseDown` method that sends a `trace` action to the Output window:

    my_mc.onMouseDown = function () {
    	trace ("onMouseDown called");
    }