CtrEditor/ObjetosSim/Dinamicos/ucBotellaCuello.xaml

<UserControl x:Class="CtrEditor.ObjetosSim.ucBotellaCuello"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="clr-namespace:CtrEditor.ObjetosSim">

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

    <Ellipse Height="{Binding Diametro, Converter={StaticResource MeterToPixelConverter}}"
             Stroke="{Binding ColorButton_oculto}" Fill="Gray"
             Width="{Binding Diametro, Converter={StaticResource MeterToPixelConverter}}" StrokeThickness="0.5"/>

</UserControl>