Suppress System.Windows.Data Error warnings

[diluculo]

PO for #291. Actually, the warnings seem to be harmless. But for our concise output window.

[BHandle]

Alternatively, they can be eliminated to preserve databinding trace handling:

I think it's actually related to the control template of the default menu item, which expects to be in an itemscontrol.

I'm using a heavily modified version of Gemini, but if you open Themes->VS2013->Controls->Menu.xaml.

All the way at the bottom you can find the default styles for both the MenuItem and the xcad:MenuItemEx. Simply modify them to force the alignment.

    <!--  Set default styles  -->
    <Style BasedOn="{StaticResource MetroSeparator}" TargetType="Separator" />
    <Style BasedOn="{StaticResource MetroMenuItem}" TargetType="MenuItem">
        <Setter Property="HorizontalContentAlignment" Value="Left" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
    </Style>
    <Style BasedOn="{StaticResource StandardMenu}" TargetType="Menu" />
    <Style BasedOn="{StaticResource MetroContextMenu}" TargetType="ContextMenu" />
    <Style BasedOn="{StaticResource MetroContextMenu}" TargetType="xcad:ContextMenuEx" />
    <Style BasedOn="{StaticResource MetroMenuItem}" TargetType="xcad:MenuItemEx">
        <Setter Property="HorizontalContentAlignment" Value="Left" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
    </Style>

[360manu]

Thanks