I’d like to add a button the the WordPress editor’s toolbar. When clicked, I want to open a modal dialog (exactly like what you get when you click the “Paste from Word” icon).
This might be more than one question, so the first question I have is what code to I need to add to my theme’s functions.php to place the button with a click event that opens a modal window similar to the Word dialog?
Here is a nice tutorial I’ve read http://www.garyc40.com/2010/03/how-to-make-shortcodes-user-friendly/
He as a great example and you cal also download the source files and get a better understanding
That’s how I added a custom button to the tinymce editor in my plugin simple TOC which you can also download , look at the code and get an even better understanding.
i followed this tutorial: http://www.ilovecolors.com.ar/tinymce-plugin-wordpress/ also has sample code.