Here is a nice and a fairly new (a year old) tutorial that i’ve read a few days ago: http://solislab.com/blog/how-to-make-shortcodes-user-friendly/ He has a great example and you can also download the source files and get a better understanding.
You can use wp_delete_post. To get all posts with the “trash” status: $trash = get_posts(‘post_status=trash&numberposts=-1’); Then: foreach($trash as $post) wp_delete_post($post->ID, $bypass_trash = true);
So I’m answering my own question, for those that face or will face the same problem. I have added two buttons. One opens wordpress’ build-in window to select a post and inserts the link. The other opens wordpress’ build-in media window to select an image. That is what somehow what you get at the end. … Read more