ValidationIndicator.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:im="clr-namespace:GrapeCity.Windows.InputMan;assembly=GrapeCity.WPF.InputMan">

    <Style TargetType="{x:Type im:GcValidationIndicator}">
        <Setter Property="Control.Padding" Value="1" />
        <Setter Property="IsTabStop" Value="False" />
        <Setter Property="Focusable" Value="False" />

        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="im:GcValidationIndicator">
                    <Grid x:Name="PART_ERRORICON" x:Shared="false" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Visibility="Hidden">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="ValidateStates">
                                <VisualState x:Name="Empty">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="PART_ERRORICON" Storyboard.TargetProperty="Visibility">
                                            <ObjectAnimationUsingKeyFrames.KeyFrames>
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Hidden</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames.KeyFrames>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="HasErrors">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="PART_ERRORICON" Storyboard.TargetProperty="Visibility">
                                            <ObjectAnimationUsingKeyFrames.KeyFrames>
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Visible</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames.KeyFrames>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>

                        <Grid.RowDefinitions>
                            <RowDefinition Height="2*"/>
                            <RowDefinition Height="6*"/>
                            <RowDefinition Height="2*"/>
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="4*"/>
                            <ColumnDefinition Width="2*"/>
                            <ColumnDefinition Width="4*"/>
                        </Grid.ColumnDefinitions>
                        <Ellipse Grid.ColumnSpan="3" Grid.RowSpan="3">
                            <Ellipse.Fill>
                                <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
                                    <GradientStop Offset="1" Color="#FFFF0000"/>
                                    <GradientStop Offset="0" Color="#FFFDFDFD"/>
                                </LinearGradientBrush>
                            </Ellipse.Fill>
                            <Ellipse.Stroke>
                                <LinearGradientBrush StartPoint="0.505,0.65" EndPoint="0.298,0.3">
                                    <GradientStop Color="#FFD3D3D3"/>
                                    <GradientStop Offset="1" Color="#D3D3D3D3"/>
                                </LinearGradientBrush>
                            </Ellipse.Stroke>
                        </Ellipse>
                        <Path Grid.Column="1" Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Center"
                              Data="M0.5,0.600 C0.5,0.544 0.544,0.5 0.600,0.5 L2.400,0.5 C2.455,0.5 2.5,0.544 2.5,0.600 L2.5,1.621 C2.5,1.676 2.455,1.721 2.400,1.721 L0.600,1.721 C0.544,1.721 0.5,1.676 0.5,1.621 z M0.500,3.315 C0.500,3.259 0.544,3.215 0.600,3.215 L2.400,3.215 C2.455,3.215 2.500,3.259 2.500,3.315 L2.500,8.400 C2.500,8.455 2.455,8.500 2.400,8.500 L0.600,8.500 C0.544,8.500 0.500,8.455 0.500,8.400 z"
                              Stretch="Fill" Stroke="#D3FFFFFF">
                            <Path.Fill>
                                <LinearGradientBrush StartPoint="0.413,0.653" EndPoint="0.39,0.297">
                                    <GradientStop Color="#FFFFFFFF"/>
                                    <GradientStop Offset="0.781" Color="#D3FFFFFF"/>
                                    <GradientStop Offset="0.982" Color="#FFFFFFFF"/>
                                </LinearGradientBrush>
                            </Path.Fill>
                            <Path.RenderTransform>
                                <RotateTransform Angle="180"/>
                            </Path.RenderTransform>
                            <Path.RenderTransformOrigin>
                                <Point X="0.5" Y="0.5"/>
                            </Path.RenderTransformOrigin>
                        </Path>

                        <ToolTipService.ToolTip>
                            <ListBox ItemsSource="{TemplateBinding ErrorContents}" BorderThickness="0" Background="Transparent"/>
                        </ToolTipService.ToolTip>
                    </Grid>

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