For some strange reason, the capital letter 'F' causes all the text following the F to disappear. If you place a backslash in front of the letter F, it works fine. I don't know if the letter F is some kind of hidden picture directive or what. I use the letter F to my advantage however. I can place text on the button, preceded by the letter F (without the backslash), and it appears during development but disappears during runtime. I use buttons that return user actions. I usually forget what button uses what user action. To find out, you have to zoom on the button and look at the properties. Instead, I put the intended label on the button and F1 or F2 etc. to tell me the user action. During development my button looks like this: 'Search F1', the 1 tells me the button uses user action 1. During runtime the button looks like this: 'Search'.
This is a really slick idea, but it is the kind of thing that can really "Bite" you in the future -- when MSE decides to get rid of an undocumented feature....