BP_Component Loading

// To create custom component I need to include this file.
// I didn't find the way to avoid this.
// BP_Component is not visible until I put this code
if ( !class_exists( 'BP_Component' ) ){
    require_once( WP_PLUGIN_DIR . '/buddypress/bp-loader.php' );
}
// so now BP is in the air and I can use it.
class BP_SHOP_Component extends BP_Component{
    function BP_SHOP_Component(){}
    // other code
}

$bp->shop = new BP_SHOP_Component();

// using bp_loaded doesn't help. It just doesn't work for me
// Any suggestions what I'm doing wrong?
// AS I understand, WP loads plugins step by step - using the order in plugins' folder. My component (/bp-shop/) is higher, than /buddypress/. So there is no BP at that loading time.