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copied!<p>You can use a value-converter that reverts the boolean value:</p> <p>With that converter, bind one Checkbox.IsChecked-property to the boolean value without the converter and one CheckBox.IsChecked-property with the converter. This should do the trick.</p> <p>Here the code for such a converter. I have copied it from <a href="http://www.codeproject.com/KB/WPF/OppositeBoolConverter.aspx" rel="noreferrer">here</a> and added some lines of code. There you will find more information about.</p> <pre><code>public class BoolToOppositeBoolConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter,System.Globalization.CultureInfo culture) { if (targetType != typeof(bool)) { throw new InvalidOperationException("The target must be a boolean"); } if (null == value) { return null; } return !(bool)value; } public object ConvertBack(object value, Type targetType, object parameter,System.Globalization.CultureInfo culture) { if (targetType != typeof(bool)) { throw new InvalidOperationException("The target must be a boolean"); } if (null == value) { return null; } return !(bool)value; } } </code></pre> <p>To use it, declare it in the resource-section.</p> <pre><code> <local:BoolToOppositeBoolConverter x:Key="BoolToOppositeBoolConverter_ValueConverter"/> </code></pre> <p>And the use it in the binding as a static resource:</p> <pre><code><CheckBox IsChecked="{Binding YourProperty}" /> <CheckBox IsChecked="{Binding YourProperty,Converter={StaticResource BoolToOppositeBoolConverter_ValueConverter}}" /> </code></pre> <p>Please note, the converter is only a simple example. Implement it neatly if you want to use it in productive code. I have not tested it. Make a comment if its not working.</p>

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