Unregister Widget

[uniganzy]

Hello,
i want to write my own portfolio widget.
Why i am not able to unregister the minit portfolio widget in the function.php in my child theme?
The wp widgets i am able to unregister successfully .

function parent_unregister_widgets() {
 
    // remove (some) WordPress default Widgets
    unregister_widget( 'WP_Widget_Media_Audio' );
    unregister_widget( 'WP_Widget_Archives' );
	unregister_widget( 'WP_Widget_Categories' );
	unregister_widget( 'WP_Widget_Meta' );
	unregister_widget( 'WP_Widget_Recent_Posts' );
	unregister_widget( 'WP_Widget_RSS' );
	unregister_widget( 'WP_Widget_Tag_Cloud' );
	unregister_widget( 'WP_Widget_Media_Video' );
 
    // remove Parent registered Widget
	unregister_widget('widget_portfolio');
 
}

add_action( 'widgets_init', 'parent_unregister_widgets', 10 );

Thanks,
fraganzy

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