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    <p>Binding does not work for CLR objects. It only works for Dependency Properties. Hence, I would turn WindowXStyle into a read-only dependency property:</p> <pre><code>using System; using System.ComponentModel; using System.Windows; namespace MyNamespace { public enum Phases { Phase1, Phase2, Phase3 } public class UIStateModel : DependencyObject { static UIStateModel() { CurrentStateProperty = DependencyProperty.Register("CurrentState", typeof(Phases), typeof(UIStateModel), new FrameworkPropertyMetadata { PropertyChangedCallback = new PropertyChangedCallback(OnCurrentStateChanged) }); Window1VisibilityPropertyKey = DependencyProperty.RegisterReadOnly("Window1Visiblity", typeof(Visibility), typeof(UIStateModel), new PropertyMetadata()); Window1VisibilityProperty = Window1VisibilityPropertyKey.DependencyProperty; Window2VisibilityPropertyKey = DependencyProperty.RegisterReadOnly("Window2Visiblity", typeof(Visibility), typeof(UIStateModel), new PropertyMetadata()); Window2VisibilityProperty = Window2VisibilityPropertyKey.DependencyProperty; } public Phases CurrentState { get { return (Phases)GetValue(CurrentStateProperty); } set { SetValue(CurrentStateProperty, value); } } public static DependencyProperty CurrentStateProperty; [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public Visibility Window1Visibility { get { return (Visibility)GetValue(Window1VisibilityProperty); } protected set { SetValue(Window1VisibilityPropertyKey, value); } } public static readonly DependencyProperty Window1VisibilityProperty; private static readonly DependencyPropertyKey Window1VisibilityPropertyKey; [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public Visibility Window2Visibility { get { return (Visibility)GetValue(Window2VisibilityProperty); } protected set { SetValue(Window2VisibilityPropertyKey, value); } } public static readonly DependencyProperty Window2VisibilityProperty; private static readonly DependencyPropertyKey Window2VisibilityPropertyKey; public Visibility Window1Visible // Databound to Window1.Visibility { get { if (this.CurrentState == Phases.Phase1) return Visibility.Visible; else return Visibility.Hidden; } } public Visibility Window2Visible // Databound to Window2.Visibility { get { if (this.CurrentState == Phases.Phase2) return Visibility.Visible; else return Visibility.Hidden; } } private static void OnCurrentPageChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) { UIStateModel element = (UIStateModel)obj; Phases oldPhase = (Phases)e.OldValue; Phases newPhase = (Phases)e.NewValue; //Probably want to use Collapsed as apposed to Hidden for UI Measure/Arrange purposes switch (oldPhase) { case Phases.Phase1: element.Window1Visibility = Visibility.Hidden; break; case Phases.Phase2: element.Window2Visibility = Visibility.Hidden; break; case Phases.Phase3: //element.Window3Visiblity = Visibility.Hidden; break; default: //?? break; } switch (newPhase) { case Phases.Phase1: element.Window1Visibility = Visibility.Visible; break; case Phases.Phase2: element.Window2Visibility = Visibility.Visible; break; case Phases.Phase3: //element.Window3Visiblity = Visibility.Visible; break; default: //?? break; } } //... } } </code></pre> <hr> <p>Take note that you'll also probably want to use Visiblity.Collapsed as apposed to Visiblity.Hidden ... Collapsed not only hides the object, but it does not affect the Measurement/Arrangement of other UIElements. Hidden affects the Measurement and Arrangement of other elements, but it doesn't actually draw the element (think of it more along the lines of "Invisible").</p>
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