WPF Data Grid Binding Data to one Different Source than Property Binds

All,

So I'm binding to my implementation which contains the security models Observable collection, my data grid in XAML binds to the Observable collection, everything works great, but i cant figure out how to bind the DataGrid background property to a local property

Background="{Binding GridColor,FallbackValue=SteelBlue}" This does not work

Can somebody point me in the right direction?

Thanks

Madaxe

public ToggleButtonSecurityGrid()
{
            InitializeComponent();
            this.DataContext= _SecurityImplementation;

}

public ObservableCollection<ApplicationSecurityModel> SecurityModels
        {
            get { return _SecurityModels; }
            set
            {
                _SecurityModels = value;
                OnPropertyChanged();
            }
        }

<DataGrid 

            Name="SecurityDataGrid"
            ItemsSource="{Binding SecurityModels, 
                                            Mode=TwoWay, 
                                            NotifyOnSourceUpdated=True, 
                                            UpdateSourceTrigger=PropertyChanged}"

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