How to replace WPF Expander's Header Image with custom Up/Down images
1) Place this code in the Resources section of your XAML UserControl or Page 2) Replace the highlighted image path with the images you want to use for WPF Expnder control Header <UserControl.Resources> <Color x:Key="WindowColor">#FFE8EDF9</Color> <Color x:Key="ContentAreaColorLight">#FFC5CBF9</Color> <Color x:Key="ContentAreaColorDark">#FF7381F9</Color> <Color x:Key="DisabledControlLightColor">#FFE8EDF9</Color> <Color x:Key="DisabledControlDarkColor">#FFC5CBF9</Color> <Color x:Key="DisabledForegroundColor">#FF888888</Color> <Color x:Key="SelectedBackgroundColor">#FFC5CBF9</Color> <Color x:Key="SelectedUnfocusedColor">#FFDDDDDD</Color> <Color x:Key="ControlLightColor">White</Color> <Color x:Key=&q