Embed flash movie in Dreamweaver extension

Hello mighty forum,

I am developing a dreamweaver extension(Command type) inside which I want to embed a flash object(a simple swf animation). I am not sure whether I use the wrong code or it's the limitation of dreamweaver extension, I just can not embed a flash object inside the html file of this extension. I can see the embedded flash object if I call this html from a browser but can not see it if I call this html from Menu (Command-->extension name). I have tried both local and remote flash file and they have the problem.

Anyone has any idea? Security issue or Dreamweaver extension doesn't allow embeding flash object?

Thank you very much.