Hi Jay
Sorry, but it would appear that isn't an option. You should
probably suggest it to the Captivate team.
Click
here to view the WishForm/Bug Reporting Form
If you are intent on getting that outer area shaded, I can
think of a way you might accomplish it.
Insert a blank slide.
Insert the oval as desired.
Ensure the edit area is 100% visible.
Screen capture the area and paste it into an image editor.
Use the image editor to fill the outside area with the
desired color.
Fill the actual oval with a unique color. Hot pink is usually
good for that.
Save the image to your hard drive and return to Captivate.
Insert the new image on the slide as an image.
Configure the oval part as transparent and set the
transparency level for the outside color and you should be set.
I know this sounds a bit long and convoluted, but in practice
it really isn't that bad.
Cheers... Rick