I don't know if I can help, but I'll try!
You can directly insert premade Flash buttons by going to the media tab on the insert bar and then choosing the second icon.....
Are you wanting to modify the actual button objects themselves?
1. In the Document window, click the Flash button object to select it.
2. Open the Property inspector, if it is not already open.
The Property inspector displays the Flash button properties. You can use the Property inspector to modify the button?s HTML attributes, such as width, height, and Bg color.
3. To make changes to content, display the Insert Flash Button dialog box using one of the following methods:
* Double-click the Flash button object.
* Click Edit in the Property inspector.
* Right-click (Windows) or Control-click (Macintosh) and choose Edit from the context menu.
4. In the Insert Flash Button dialog box, make your edits in the fields described in Inserting a Flash button object.
In the Design view, you can resize the object easily by using the resizing handles. You can return the object to its original size by selecting Reset Size on the Property inspector (see Resizing an image).
That info is straight from the Using DW help files under Flash button object/modifying. I may have totally misunderstood what you're asking though......

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HTH,
Sherill