# Button._alpha

#### Availability

Flash Player 6.

#### Usage

    my_btn._alpha

#### Description

Property; the alpha transparency (`value`) of the button specified by `my_btn`. Valid values are 0 (fully transparent) to 100 (fully opaque). Objects in a button with `_alpha` set to 0 are active, even though they are invisible.

#### Example

The following sets the `_alpha` property of a button named `star_btn` to 30%.

    on(release) {
    	star_btn._alpha = 30;
    }