CtrEditor/ObjetosSim/Estaticos/ucDescarte.xaml

<UserControl x:Class="CtrEditor.ObjetosSim.ucDescarte"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:CtrEditor.ObjetosSim"
             mc:Ignorable="d" 
             xmlns:vm="clr-namespace:CtrEditor.ObjetosSim"
             xmlns:convert="clr-namespace:CtrEditor.Convertidores">
    <UserControl.Resources>
        <convert:MeterToPixelConverter x:Key="MeterToPixelConverter"/>
        <Storyboard x:Key="PulsingStoryboard" RepeatBehavior="Forever">
            <DoubleAnimation 
                Storyboard.TargetName="AnimatedEllipse"
                Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)"
                From="1" To="0.5" Duration="0:0:1" AutoReverse="True" />
            <DoubleAnimation 
                Storyboard.TargetName="AnimatedEllipse"
                Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)"
                From="1" To="0.5" Duration="0:0:1" AutoReverse="True" />
        </Storyboard>
    </UserControl.Resources>

    <UserControl.DataContext>
        <vm:osDescarte/>
    </UserControl.DataContext>

    <Grid>
        <Ellipse
            Height="{Binding Diametro, Converter={StaticResource MeterToPixelConverter}}"
            Width="{Binding Diametro, Converter={StaticResource MeterToPixelConverter}}"
            Stroke="Yellow" 
            Fill="Black"
            Opacity="0.5"/>
        <Ellipse x:Name="AnimatedEllipse"
                 Height="{Binding Diametro, Converter={StaticResource MeterToPixelConverter}}"
                 Width="{Binding Diametro, Converter={StaticResource MeterToPixelConverter}}"
                 Stroke="Blue" 
                 Fill="Transparent"
                 RenderTransformOrigin="0.5,0.5">
            <Ellipse.RenderTransform>
                <TransformGroup>
                    <ScaleTransform />
                </TransformGroup>
            </Ellipse.RenderTransform>
        </Ellipse>
    </Grid>
</UserControl>