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POAmbiguous type reference. A type named `VisualState` occurs in at least two namespaces
 

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  1. POAmbiguous type reference. A type named `VisualState` occurs in at least two namespaces
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    <p>What is the following error?</p> <blockquote> <p>Ambiguous type reference. A type named 'VisualState' occurs in at least two namespaces, 'System.Windows' and 'System.Windows'. Consider adjusting the assembly XmlnsDefinition attributes.</p> </blockquote> <p>UserControl:</p> <pre><code>&lt;UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="ButtonWPF.MyButtonAdd" x:Name="AddButton" d:DesignWidth="84" d:DesignHeight="87"&gt; &lt;UserControl.Resources&gt; &lt;Style x:Key="ButtonStyle1" TargetType="{x:Type Button}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type Button}"&gt; &lt;Grid x:Name="grid" RenderTransformOrigin="0.5,0.5"&gt; &lt;Grid.RenderTransform&gt; &lt;TransformGroup&gt; &lt;ScaleTransform/&gt; ............. &lt;Trigger Property="IsDefaulted" Value="True"/&gt; &lt;Trigger Property="IsMouseOver" Value="True"/&gt; &lt;Trigger Property="IsPressed" Value="True"/&gt; &lt;Trigger Property="IsEnabled" Value="False"/&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/UserControl.Resources&gt; &lt;Grid x:Name="LayoutRoot" Height="79" Width="72"&gt; &lt;Button Content="" HorizontalAlignment="Left" Height="61" Style="{DynamicResource ButtonStyle1}" VerticalAlignment="Top" Width="57"/&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>MainWindow:</p> <pre><code>&lt;Window x:Class="ButtonWPF.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:dg="http://schemas.microsoft.com/wpf/2008/toolkit" xmlns:my="clr-namespace:ButtonWPF" Title="winGroup" Height="637" Width="638" FontSize="15" FontWeight="Bold"&gt; &lt;Grid&gt; &lt;my:MyButtonAdd HorizontalAlignment="Left" Margin="540,519,0,0" x:Name="btnAdd" VerticalAlignment="Top" IsEnabled="True"/&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre>
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    1. COWhere exactly does the error show up? I don't even see VisualState being used anywhere in your XAML, so it's a bit difficult to determine. My initial guess, though, is that maybe you have imported two different versions of the DLL for the `System.Windows` namespace.
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      1. POAmbiguous type reference. A type named `VisualState` occurs in at least two namespaces
      1. USKen Wayne VanderLinde
    2. COUpdate Question
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    3. COPossible duplicate http://stackoverflow.com/questions/4913910/design-time-error-visualstate-occurs-in-at-least-two-namespaces
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      1. USTomislav Markovski
 

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