Thought I'd post this since it took me 2 days to figure it out. I have 2 items on my Main Menu with Text and Image buttons. The first item has a red rose as the button media and text. The second item has a white rose as the button media and text. I wanted the red rose to appear when Item #1 is selected and DISAPPEAR when not selected. I wanted the white rose to appear when item #2 is selected and DISAPPEAR when not selected. Here are the steps on how to do this:

Create 3 images in any graphics program. In this sample I am using a white rose, a red rose and a black square. The background media of my Main Menu is solid black.
1) Red rose – color rose image red with black background, make background transparent, save as RedRose.GIF
2) White rose – color rose image white with black background, make background transparent, save as WhiteRose.GIF
3) Black square – using red or white rose image, fill entirely with black, save as “BlackButton.GIF”

Select Main Menu \ General Tab
1) Set “Selected button colors” to Color Set 2
2) Set “Activated button colors” to Color Set 2
3) Set “Inactive button colors” to Color Set 4

Select Main Menu \ Color Sets Tab
1) Set Color Set 2 colors to any color you like, but make all 4 modes 100% transparent
2) Set Color Set 4 colors to same color as the Main Menu background (in this case black)
a. Set Modes 1-3 to 100% opaque
b. Leave Mode 4 set to 100% transparent

Select Button 1 (red rose)
1) Go to Button Properties \ Media
a. Select thumbnail media (RedRose.GIF)
b. Set “Mask” to “None”
c. Set Frame media to “None”
d. Set Frame mask to “None”
2) Go to Button Properties \ Highlight
a. Set Style to “Custom”
b. Set Mask to “BlackButton.GIF”
c. Set Mask Mapping to “Transparency”

Select Button 2 (white rose)
1) Go to Button Properties \ Media
a. Select thumbnail media (WhiteRose.GIF)
b. Set “Mask” to “None”
c. Set Frame media to “None”
d. Set Frame mask to “None”
2) Go to Button Properties \ Highlight
a. Set Style to “Custom”
b. Set Mask to “BlackButton.GIF”
c. Set Mask Mapping to “Transparency”

Now when Button 1 is selected it will display the RedRose.GIF graphic, and when it is not selected it will not appear having been masked by the BlackBox.GIF.

When Button 2 is selected it will display the WhiteRose.GIF graphic, and when it is not selected it will not appear having been masked by the BlackBox.GIF

This only works if the “BlackBox.GIF” graphic exactly matches the background color of the Menu background graphic.