Buttons in white box... .should have background of page

I'm new to fireworks. Created a navbar with buttons. Canvas set to transparant,

as also the buttons in the up state.
 After export and import to Dreamweaver. The navbar is white, allthough I 
expected the page-background to 'shine through. I cannot make canvas the same 
color as the page background, since the background has a gradient fill...
 What am I doing wrong ?
 Tnx for any help.
 Hugo

Open up your nav bar, and then head to File > Image Preview. Select
"GIF" as 
the export option. Select the Eye Dropper tool on the bottom left, and click 
the color you want to be transparent (probably white) in your artwork.

 Click export at the bottom and and you should be in good shape!

it worked - tnx