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Sunburst effect using a third party filter.
The Sunburst effect is not a built-in filter in Fireworks, you will have to use a third party filter compatible with Fireworks. So, first of all, download the free and fireworks compatible DBS filters with 8BF extension. Drop them in your plugin folder Fireworks (whatever your version) > Plug-Ins then restart Fireworks. From the 21 filters we will just use the Mirror Center filter
Select Rectangle Tool and draw a rectangle then fill it with a linear gradient going from white to black.

Figure 1: Completed Tutorial

Figure 2: Completed Tutorial
Tip: Once your gradient is made, save it as a Style to be re-used more easily throughout your documents. With the rectangle still selected, go to Assets panel > Styles tab > New Style
With your rectangle still selected, go to Filter menu > DSB flux > Center Mirror. Select 15 rays and no value for rotation but you may choose your own values.

Figure 3: Completed Tutorial
The result is a bitmap image with black and white colors.

Figure 4: Completed Tutorial

Figure 5: Completed Tutorial
You may modify the colors of your linear gradient to obtain a bi-color sunburst effect (see step 2). Here is our example: #0061A0 -> #079DFF .

Figure 6: Completed Tutorial
With these easy 2 steps you get the path in vectors so you can resize it or modify its colors or whatever.

Figure 7: Completed Tutorial