How to edit imported pictures, help please.

[angelitos]

I import my artwork from photoshop or internet, png8, or bitmap, i convert it to symbol, and double click the scenario, then i try to change color for example and instead of painting the color in the artwork it paints under the imported picture. When I draw a picture in flash it works good.
Thank you

[Sethfx]

Modify-Bitmap-Trace Bitmap