You can assigned the entities in the ComponentDefinition a layer, and you can assign ComponentInstances a layer. And while practically you can apply a layer to a definition, SketchUp ignores this.

@kat said: Yes exactly, that was my question, i didn't understand why i needed to add two different sizes of icons to the Command. I think i did everything as explaned in the API docs, but i still won't display the icon. Are there any settings that i should check? Or something like .visible = true? From your code it appear you only added small icon. Hav eyou set your toolbar view to Small Icons? The default are Large.

Thanks, can't see why i didn't think of that...

You don't need Java for webdialogs. Javascript on the other hand, and HTML + CSS.

Hey thanks, this last one was a very good tip. I think what AdamB proposed is a very professional approach of the problem. I 've tried it out in my code and it works fantastically. Yet, it would be interesting to understand WHY this actually works, does someone know a bit more about the matematical background of this vector based solution?

yes, it works! I made my windows in the SU components folder in the upright position, should have done it in the horizontal plane... thanks a lot tig!!!