Silverlight Custom Control Binding

I'm trying to make a silverlight custom control that contains a busy indicator and a content presenter.  I want the busy indicator "IsBusy" property to be bound to a property in the datacontext of the content control content.

I've attached my control, generic.xaml and part of the view service that attaches they viewmodel to the view.  

I want to bind the "IsBusy" property to a property called "IsReady" in the viewmodel.  I will need to use a converter as well to inverse the IsReady property.  

How would I do this?

// My custom control 
public class BusyControl : ContentControl
    {
        public BusyControl()
        {
            this.DefaultStyleKey = typeof(BusyControl);
        }

        public static readonly DependencyProperty IsBusyProperty = DependencyProperty.Register("IsBusy", typeof(bool), typeof(BusyControl), new PropertyMetadata(null));

        public bool IsBusy
        {
            get { return (bool)GetValue(IsBusyProperty); }
            set { SetValue(IsBusyProperty, value); }
        }
    }

// Generic.xaml
<ResourceDictionary xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:Sdi.Silverlight.Core">


    <Style TargetType="local:BusyControl">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="local:BusyControl">
                    <Border Background="{TemplateBinding Background}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}">
                        <toolkit:BusyIndicator x:Name="PART_BusyIndicator" IsBusy="{TemplateBinding ?}">

                            <toolkit:BusyIndicator.BusyContentTemplate>
                                <DataTemplate>
                                    <StackPanel>
                                        <TextBlock Text="Processing...Please Wait"></TextBlock>
                                    </StackPanel>
                                </DataTemplate>
                            </toolkit:BusyIndicator.BusyContentTemplate>

                            <ContentPresenter x:Name="PART_Content" Content="{TemplateBinding Content}"/>

                        </toolkit:BusyIndicator>

                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>



//In My View Service
public void ShowView(IViewModel viewModel, UserControl view, object parameters)
        {
            Guard.ArgumentNotNull(viewModel, "viewModel");
            Guard.ArgumentNotNull(view, "view");
            
            _currentViewModel = viewModel;
            _currentView = view;

            this.CurrentShell.CurrentContentContainer.Content = view;
                   
            viewModel.Load(parameters);
          
            view.DataContext = viewModel;

            OnPropertyChanged("CurrentView");
            OnPropertyChanged("CurrentViewModel");
        }

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