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I am trying to make my application more customizable by allowing users to pick a color from a Color Picker dialog, and then changing the style of the application in real time (with DynamicResource ) How do I go about in changing specific resources that reside in the app.xaml ? I have tried something like this but no luck (just a test): var colorDialog = new CustomControls.ColorPickerDialog(); var dResult = colorDialog.ShowDialog(); var x = Application.Current.Resources.Values.OfType<LinearGradientBrush>().First(); x = new LinearGradientBrush(); x.GradientStops.Add(new GradientStop(colorDialog.SelectedColor,1)); This an excerpt of the app.xaml file: <Application.Resources> <LinearGradientBrush x:Key="HeaderBackground" StartPoint="0.5,0" EndPoint="0.5,1"> <GradientStop Color="#82cb02" Offset="1"/> <GradientStop Color="#82cb01" Offset="0.2"/> <GradientStop Color="#629a01" Offset="0.5"/> </LinearGradientBrush> </Application.Resources> What is the best way to allow this form of customizability (basically just changing some colors) to an application? [Update] I just found this answer from a previous question that was asked, and tried it but I am getting the same InvalidOperationException exception Petoj mentioned in the comments for the given answer. Here is the sample code from the answer: Xaml : <LinearGradientBrush x:Key="MainBrush" StartPoint="0,0.5" EndPoint="1,0.5" > <GradientBrush.GradientStops> <GradientStop Color="Blue" Offset="0" /> <GradientStop Color="Black" Offset="1" /> </GradientBrush.Gradie

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