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Another issue I found on StackOverflow, which is way more tricky that it seems. Let’s say we have a Silverlight WP7 application, and we want to add a drag&drop scenario. The user first taps an element, drags his finger to another, and raises his finger on another element. Easy enough! Just handle the MouseLeftButtonDown on each element, store which element triggered the event in a property, handle the MouseLeftButtonUp on each element, and then we have the originator and the destination! … right? Well, so I would have thought. Unfortunately, the MouseLeftButtonUp event will only be triggered if the ‘mouse’ left button (or your finger,Read More →

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It’s an interesting issue I found on StackOverflow. Interesting because I often forget to test my applications using the Windows Phone’s white theme, so this kind of problem usually goes unnoticed until a user reports it. Create a simple WP7 application with a black background and an ApplicationBar. Add a button to toggle the bar’s visibility. The XAML should look like: And the ButtonClick method: Now launch the WP7 emulator, go in the settings, and set the phone theme to ‘light’. Then start the application, and try pressing the button: the application bar disappears as expected, but you may notice a quick white flickering. TheRead More →