MultiImageView_2.xaml

<UserControl.Resources>
    <Style x:Key="InvisibleButtonStyle" TargetType="{x:Type Button}">
        <Setter Property="SnapsToDevicePixels" Value="true" />
        <Setter Property="OverridesDefaultStyle" Value="true" />
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Border Name="Border"
                            Background="Transparent"
                            BorderBrush="Transparent">
                        <ContentPresenter Margin="0"
                                          HorizontalAlignment="Stretch"
                                          VerticalAlignment="Center"
                                          RecognizesAccessKey="True" />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsKeyboardFocused" Value="true">
                            <Setter TargetName="Border" Property="BorderBrush" Value="Transparent" />
                        </Trigger>
                        <Trigger Property="IsDefaulted" Value="true">
                            <Setter TargetName="Border" Property="BorderBrush" Value="Transparent" />
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="true">
                            <Setter TargetName="Border" Property="Background" Value="Transparent" />
                        </Trigger>
                        <Trigger Property="IsPressed" Value="true">
                            <Setter TargetName="Border" Property="Background" Value="Transparent" />
                            <Setter TargetName="Border" Property="BorderBrush" Value="Transparent" />
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter TargetName="Border" Property="Background" Value="Transparent" />
                            <Setter TargetName="Border" Property="BorderBrush" Value="Transparent" />
                            <Setter Property="Foreground" Value="Transparent" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</UserControl.Resources>