I’m trying to Bind the foreground of a Label inside a DataTemplate to an Ancestor, this is the extract:

ViewModel Code

    public class DeviceOverview
    {
        public string DeviceName { get; set; }
        public string DeviceState { get; set; }
    }

    public ObservableCollection<DeviceOverview> DeviceOverviewList { get; set; }

This is the xaml:

                            <ItemsControl ItemsSource="{Binding DeviceOverviewList}">
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <DockPanel Margin="20,5,5,5">
                                        <Image Source="{Binding DeviceState, Converter={StaticResource ConvertStateToLed}}" Width="30"/>
                                        <Label Content="{Binding DeviceName}" Width="220" Margin="-60,0,0,0"  Foreground="{Binding RelativeSource={RelativeSource AncestorType=Window}, Path=DataContext.FontColor}"/>
                                    </DockPanel>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>

The Window control has its own DataContext with his ViewModel and its property FontColor, and everything works. Still, i get the following error:

The FontColor property was not found in the DeviceOverview object.

Why do I get this error? And how do I can get rid of it?
Thanks