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Using the Static Visibility Enum Parameter as a Command Parameter

So this problem seems awkwardly simple, but somehow I can't figure it out, so I will ask anyway ...

I want to use Visibilitythis way in CommandParameter KeyBinding(note the section <!--THIS LINE-->):

<Window ...
    xmlns:sys="clr-namespace:System;assembly=System"
    ...>
...
<Window.InputBindings>
</Window.InputBindings>
<Grid DataContext="{StaticResource MainWindowVM}">
    ...
    <ScrollViewer Grid.Column="0" Grid.Row="1" Background="Gray">
        <ScrollViewer.InputBindings>
        ...
            <!--THIS LINE--><KeyBinding Key="OemOpenBrackets" Command="{Binding EditLeftBarLineVisibilityCommand}" CommandParameter="{x:Static sys:Visibility.Visible}"/>
            <!--THIS LINE--><KeyBinding Key="OemCloseBrackets" Command="{Binding EditRightBarLineVisibilityCommand}" CommandParameter="{x:Static sys:Visibility.Visible}"/>
        </ScrollViewer.InputBindings>
        ...
    </ScrollViewer>
</Grid>

But it seemed that:

The name "Visibility" does not exist in the namespace "clr: System namespace; assembly = System"

I look Visibilityin my virtual machine and is in System.Windows, but I can’t find that on XAML above ( System) is the closest I found, and it didn’t work out very well.

- , XAML? ( System.Windows XAML, , , , VM ?)

, ObjectDataProvider System Enum? ( ObjectDataProvider, )

P.S. MSDN: http://msdn.microsoft.com/en-us/library/system.windows.uielement.visibility%28v=vs.95%29.aspx

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WPF XML (http://schemas.microsoft.com/winfx/2006/xaml/presentation), :

CommandParameter="{x:Static Visibility.Visible}"
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