// Remove WordPress Welcome Widget
remove_action('welcome_panel','wp_welcome_panel');

// Remove all WordPress Core Dashboard Widgets
add_action('wp_dashboard_setup', 'remove_dashboard_widgets' );
function remove_dashboard_widgets() {
	global $wp_meta_boxes;

	unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_activity']);
	unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_right_now']);
	unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_comments']);
	unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_drafts']);
	unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_quick_press']);
	unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_incoming_links']);
	unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_plugins']);
	unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_primary']);
	unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary']);
	//unset($wp_meta_boxes['dashboard']['normal']['core']['yoast_db_widget']);

}

// Create another widget
add_action('wp_dashboard_setup', 'dashboard_widget');
function dashboard_widget() {
	global $wp_meta_boxes;
	wp_add_dashboard_widget('custom_help_widget', 'Suporte', 'suporte_dashboard');
}
// New Widget Content
function suporte_dashboard() {
	printf('<h3>Encontrou algum problema?</h3><p>www.cada-um-com-seus-problemas.com</p>');
}