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copied!<p>Ok, for those that happen to run into the same issue, here's what I finally did:</p> <p>In XAML:</p> <pre><code><src:ConvertMinDate x:Key="ConvertMinDate"/> <Style TargetType="{x:Type my:DatePicker}"> <Style.Triggers> <DataTrigger Binding="{Binding Path=SelectedDate, RelativeSource={RelativeSource Self}, Converter={StaticResource ConvertMinDate}}" Value="True"> <Setter Property="Foreground" Value="DarkGray"/> <Setter Property="ToolTip" Value="Select a date"/> <Setter Property="FontStyle" Value="Italic"/> </DataTrigger> </Style.Triggers> </Style> </code></pre> <p>In codebehind:</p> <pre><code>public class ConvertMinDate : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (value == null) { return true; } else { DateTime date = Peche.Properties.Settings.Default.MinDate; if (value is DateTime) { date = (DateTime)value; return date == Peche.Properties.Settings.Default.MinDate; } else { return true; } } } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } } </code></pre> <p>MinDate has been set to 1st of january 1990 in the Settings section of my project.</p> <p>So now, if the SelectedDate is either null or equals MinDate, the converted return true, thus triggering the DataTrigger and changing the style if the DatePickerTextBox.</p> <p>Isn't WPF just great? :-)</p>

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