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My goal is to manipulate the text-styles of my application via DependencyProperties. I got a diagram in which the texts are to be manipulated in size, fontfamily, color, etc. So I'd like to use an interface similar to a rich text editor like Word. I'm using this code in my TextStyleVM http://shevaspace.blogspot.com/2006/12/i-have-some-fun-with-formattedtext_14.html So I have a FontFamilyProperty and a Getter and Setter for it: public static DependencyProperty FontFamilyProperty = DependencyProperty.Register( "FontFamily", typeof(FontFamily), typeof(OutlinedText), new FrameworkPropertyMetadata( SystemFonts.MessageFontFamily, FrameworkPropertyMetadataOptions.AffectsRender | FrameworkPropertyMetadataOptions.AffectsMeasure), new ValidateValueCallback(IsValidFontFamily)); public FontFamily FontFamily { get { return (FontFamily)base.GetValue(FontFamilyProperty); } set { base.SetValue(FontFamilyProperty, value); } } Then there is a ToStyle method, which sets the style for the labels of the diagram, which are to be manipulated: Style style = new Style(); Binding fontFamilyBinding = new Binding("FontFamily"); fontFamilyBinding.Source = this; Setter fontFamilySetter = new Setter(); fontFamilySetter.Property = TextBlock.FontFamilyProperty; fontFamilySetter.Value = fontFamilyBinding; style.Setters.Add(fontFamilySetter); return style; Now this works for a TextBox. The textbox displays the current FontFamily, and if I enter a new, valid FontFamily like Arial into the textbox the FontFamily of the labels are changed. However,

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