Built in Flash button in DM does not work

Hi

I am using built in flsh buttons in the dreamweaver. I have created extra buttons and place them in the C:\Program Files\Macromedia\Dreamweaver 8\Configuration\Flash Objects\Flash Buttons

and
C:\Program Files\Macromedia\Dreamweaver 8\Configuration\Flash Objects\Flash Buttons Preview

folders. When I want to insert the new buttons they do not show up in the dreamweaver mx. Can some one explain why and what needs to be done please?

Thanks