ShrlAlgoToolkit/Melskin/Controls/TextBoxContextMenu.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:controls="clr-namespace:Melskin.Controls">

    <Style x:Key="DefaultTextBoxContextMenuStyle" TargetType="{x:Type ContextMenu}">
        <Setter Property="FontSize" Value="14" />
        <Setter Property="Padding" Value="2,0" />
        <Setter Property="Foreground" Value="{DynamicResource TextPrimaryBrush}" />
        <Setter Property="Background" Value="{DynamicResource BackgroundLayoutBrush}" />
        <Setter Property="BorderBrush" Value="{DynamicResource BorderGradientBrush}" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="OverridesDefaultStyle" Value="True" />
        <Setter Property="Grid.IsSharedSizeScope" Value="true" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ContextMenu}">
                    <Grid>
                        <Border
                            x:Name="Border"
                            Margin="8"
                            Padding="0"
                            Background="{TemplateBinding Background}"
                            BorderThickness="0"
                            CornerRadius="4"
                            Effect="{DynamicResource PopupShadow}">
                            <StackPanel
                                Margin="2,1"
                                IsItemsHost="True"
                                KeyboardNavigation.DirectionalNavigation="Cycle" />
                        </Border>
                        <Rectangle
                            Margin="8"
                            RadiusX="4"
                            RadiusY="4"
                            Stroke="{TemplateBinding BorderBrush}"
                            StrokeThickness="{TemplateBinding BorderThickness}" />
                    </Grid>

                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <ContextMenu x:Key="TextBoxContextMenu" Style="{StaticResource DefaultTextBoxContextMenuStyle}">
        <MenuItem Command="ApplicationCommands.Copy">
            <MenuItem.Icon>
                <controls:IconElement Foreground="{DynamicResource TextPrimaryBrush}" Symbol="ContentCopy" />
            </MenuItem.Icon>
        </MenuItem>
        <MenuItem Command="ApplicationCommands.Cut">
            <MenuItem.Icon>
                <controls:IconElement Foreground="{DynamicResource TextPrimaryBrush}" Symbol="ContentCut" />
            </MenuItem.Icon>
        </MenuItem>
        <MenuItem Command="ApplicationCommands.Paste">
            <MenuItem.Icon>
                <controls:IconElement Foreground="{DynamicResource TextPrimaryBrush}" Symbol="ContentPaste" />
            </MenuItem.Icon>
        </MenuItem>
    </ContextMenu>
</ResourceDictionary>