On my previous post I showed an option to cause a message to appear by clicking on a button. I had played for a while in Blend 2.5 with the obvious functions and animations to achieve this but for some reason it didn't work out. For the opacity of the text the xaml in Blend showed errors. Visual Studio 2008 didn't show any errors but it wouldn't debug either. As for the visibility function it just doesn't work when the timeline recording is on. I get a pop up window describing: "Invalid Property Value: The Property Value is not Valid" (I like how it's refrased in case we didn't get it).

Finally I came up with the last resort, playing with a color animation. Only last night I kicked, digged, dzoned, etc. the article with a very nice result since I received useful comments. Sean made me want to give the opacity another try because it really didn't make any sense that it didn't work. He also mentions that it would be more useful in the case of having a video or an image.  So thanks to Sean here is the result: