I hav ethe follwing customor scenario: I have created a Horizontal Gallery, which I use to gather Survey Info. Once you enable the "ShowNavigation" Option, I want to be able to decide which navigation direction is available to the user. This would be an easy way to block the enduser who wants to go back to previous selections and make modification. Of course there are alternatives such as using seperate screens, but I don't want to create a seperate screen for each Survey Question. I want to use a single screen, but use a gallery to move through the Survey questions. Why I'm not using Forms? Well, because I'm using a combination of controls which just aren't available in Forms. As an alternative, I've used a rectagle control on top of the Galllery Navigation control with conditional visibility.