wp customizer theme switcher

<?php
    /**********************************/
    /*add Beast Scheme Switcher section*/
    /**********************************/
    $wp_customize->add_section( 'beast_scheme_section' , array(
        'title'       => __( 'Preset Theme Styles', 'beast' ),
        'priority'    => 40,
        'description' => 'Gives user the ability to select preset color schemes for theme',
        )
    );

    /*add Beast Scheme Switcher setting*/
    $wp_customize->add_setting(
        'beast_scheme_switch',
        array(
            'default'   => 'Default',
            'transport' => 'postMessage'
        )
    );

    /*add Beast Scheme Switcher control*/
    $wp_customize->add_control(
        'beast_scheme_switch', array(
            'section'  => 'beast_scheme_section',
            'label'    => 'Select Your Scheme',
            'type'     => 'select',
            'choices'  => array(
                'default'       => 'Default',
                'red'       => 'Red',
                'orange'        => 'Orange',
                'yellow'        => 'Yellow',
                'green'         => 'Green',
                'blue'      => 'Blue',
                'purple'        => 'Purple',
                'white'     => 'White'
            )
        )
    );

?>