[C# WPF] Invalid Markup

[Daniel Holzmann]

In my WPF application the Designer doesnt work -> “Invalid Markup”
The error code: “The memeber HasGazeChanged is not recognized or accessible”

        <Style x:Key="EyeXGazeAwareEllipse" BasedOn="{StaticResource EyeXGazeAwareElement}" TargetType="Ellipse">
            <Setter Property="eyeX:Behavior.GazeAware" Value="True"></Setter>
            <Setter Property="eyeX:Behavior.GazeAwareDelay" Value="100"></Setter>
        </Style>

-> <Ellipse Style="{StaticResource EyeXGazeAwareEllipse}" eyeX:Behavior.HasGazeChanged="OnHasGazeChanged" Grid.Row="0" Width="150" Stroke="Black" StrokeThickness="2" ></Ellipse>
The strange thing is that i can build the app and it works fine, also the OnHasGazeChanged event works!

What i have already tried:
– check namespache (xmlns:eyeX=”clr-namespace:EyeXFramework.Wpf;assembly=EyeXFramework”)
– check dll´s and framework (Client.dll = x64, EyeXFramework = x64 and application also x64)
– clean/rebuild and restart VS2015

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