When adding buttons to the tinyMCE editor, how do I make them wrap to the next line and/or display in the “Kitchen Sink” area?

I imagine you’re also adding a filter mce_buttons to add in the button to, something like..

add_filter( 'mce_buttons', 'add_my_tinymce_buttons' );

function add_my_tinymce_buttons( $items ) {
    $items[] = 'your-button';
    return $items;
}

Just change the filter to hook onto mce_buttons_2 instead, and the button will appear on the second row , eg..

add_filter( 'mce_buttons_2', 'add_my_tinymce_buttons' );

Hope that helps.. 🙂