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copied!<p>In Silverlight (upon which the Windows Phone 7 framework is built) the <code>Button</code> control does not have an <code>Image</code> property. I presume that you have created your original buttons by placing an <code>Image</code> element as the child of the <code>Button</code>. On the assumption that you want the same behavior for a whole set of buttons, then it might make sense to use visual states instead. You coudl achieve a consistent look-and-feel by changing the opacity of the <code>ContentPresenter</code>, e.g. An <code>Opacity</code> of 0.75 for the "Normal" state and and <code>Opacity</code> of 1.0 for the "Selected" state.</p> <p>Determing which button is the selected one would be the trickier part, but if you wrap your buttons in a <code>ListBox</code> then you can use the "Selected" visual state in the <code>ItemContainerStyle</code>.</p> <p>If you want to continue with the approach that you've already taken, then given that you know that the content of the button is an <code>Image</code>, you could do something like the following:</p> <pre><code>private void button1_click(object sender, RoutedEventArgs e) { Button source = (Button)sender; Image content = source.Content as Image; if (null != content) { content.Source = new BitmapImage(new Uri("image path")); } }</code></pre> <p>In this approach you would, of course, also need to handle reverting the other buttons back to their "Normal" state, which the <code>ListBox</code> approach would handle for you.</p>

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