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    <p>The problem is you've placed additional code in your Setter. When using Dependency properties the setter is not always called, for example when some other external code calls <code>SetValue</code> passing in <code>SolidGlossTypeProperty</code> and a new value, your setter is not called.</p> <p>You sould use the property callback method to perform additional operations instead.</p> <p><strong>Edit</strong></p> <p>For example:-</p> <pre><code>public SolidGlossTypes SolidGlossType { get { return (SolidGlossTypes)GetValue(SolidGlossTypeProperty); } set { SetValue(SolidGlossTypeProperty, value); } } public static readonly DependencyProperty SolidGlossTypeProperty = DependencyProperty.Register( "SolidGlossType", typeof(SolidGlossTypes), typeof(SolidGloss), new PropertyMetadata(SolidGlossTypes.Normal, OnSolidGlossTypePropertyChanged)); private static void OnSolidGlossTypePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { SolidGloss source = d as SolidGloss; SolidGlossTypes value = (SolidGlossTypes)e.NewValue switch (value) { case SolidGlossTypes.Header: source.SolidGloss_Upper.Visibility = Visibility.Visible; source.SolidGloss_Lower.Visibility = Visibility.Collapsed; break; case SolidGlossTypes.Footer: source.SolidGloss_Upper.Visibility = Visibility.Collapsed; source.SolidGloss_Lower.Visibility = Visibility.Visible; break; case SolidGlossTypes.None: source.SolidGloss_Upper.Visibility = Visibility.Collapsed; source.SolidGloss_Lower.Visibility = Visibility.Collapsed; break; default: source.SolidGloss_Upper.Visibility = Visibility.Visible; source.SolidGloss_Lower.Visibility = Visibility.Visible; break; } } </code></pre> <p>In this arrangement whenever the value of <code>SolidGlossTypeProperty</code> is changed by whatever means (the setter in your code, by animation or by other direct calls to <code>SetValue</code>) the callback property changed method will always be called.</p>
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    1. CO+1, also, you might want to consider making the enum a first class object and putting the associated values on that rather than in your set method
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    2. COOkay, I am lost as to how to use the property callback method (I can't figure out what to put in the switch statement instead of 'value'.
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    3. COAlex: I don't understand what you mean.
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