Button to open up nyroModal lightbox

Hi,

I really need some help here. I need the ability to add a custom button to the editor that will open up a nyromodal lightbox. I already have the lightbox working from a link on the page where the editor resides but need the link to be one of the buttons on the toolbar when a user is in full screen mode.

Basically I need a button that acts as a simple <a href link that i can add a class to. i.e.

<a href="lightbox_content.html" class="nyroModal">Button Image</a>

I tried using window.open in my Command but I have no way to add the class to it. I doubt this would even work as that just opens a new window/tab anyway.

Any help will be Greatly appreciated!

Thank you in advance.

Max