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Adding Popup Message to Category Poster

I am a newbie and using the videoplayer example as the framework for my channel. I have one category and need to add another. I know how to add another category to my homeScreen, but I want this category to display a popup message when it is clicked instead of going to pull an xml feed. On this popup, I want to display contact information for our organization and a short sentence about us, along with a back button. I have searched the forums and came up empty on this. I also checked the SDK documentation and I couldn't figure out where to use the "ShowMessage(message as String) as Void" function or how I could enter the text I wanted to display on the box. Can anyone help walk me through this? I would really appreciate any direction.

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