Flash CS3 Tutorial
How to Add Glow to Movie Symbol, Text or Button using the Flash Glow Filter
Glow effects create the illusion of object back lighting.
Add a rectangular object to the workspace with the Rectangle tool (r key).
Select the rectangle and convert it to a Movie Symbol (Modify > Convert to Symbol (F8)).
With the rectangle Movie Symbol still selected, open the Filters panel by clicking the Filters tab (Window > Properties > Filters).
Add a filter to the Filter panel by clicking the plus (+) icon and selecting Glow from the pull-down menu.
In the dialog box, adjust the Blur, then set the Color.
Adjust the Strength and set the Quality to Low, Medium or High.