Template Binding to background and foreground colors?

I'm building a simple ControlTemplate for a Button. I want to draw a 2 color gradient, and bind the two colors so I don't need to hard code t开发者_开发技巧hem in the template. But since Background and Foreground are Brushes and not just Colors, I'm not sure this will work.

Can anyone tell me if there is a good way to do this? it seems simple enough. Thanks.

<ControlTemplate x:Key="ElipseButton" TargetType="Button">
  <Ellipse>
   <Ellipse.Fill>
    <RadialGradientBrush RadiusX="1" RadiusY="1" GradientOrigin="0.7,0.8">
              <GradientStop Color="White" Offset="0"/>
     <GradientStop Color="Black" Offset="1"/>
    </RadialGradientBrush>
   </Ellipse.Fill>
  </Ellipse>
 </ControlTemplate>

I want to replace the 'Black' and 'White' colors with TemplateBindings.

You can use attached properties to add some new Color properties that you can use on Button:

public class ColorExtensions
{
    public static readonly DependencyProperty ColorFrontProperty = DependencyProperty.RegisterAttached(
        "ColorFront",
        typeof(Color),
        typeof(ColorExtensions),
        new UIPropertyMetadata(Colors.White));

    public static Color GetColorFront(DependencyObject target)
    {
        return (Color)target.GetValue(ColorFrontProperty);
    }

    public static void SetColorFront(DependencyObject target, Color value)
    {
        target.SetValue(ColorFrontProperty, value);
    }

    public static readonly DependencyProperty ColorBackProperty = DependencyProperty.RegisterAttached(
        "ColorBack",
        typeof(Color),
        typeof(ColorExtensions),
        new UIPropertyMetadata(Colors.Black));

    public static Color GetColorBack(DependencyObject target)
    {
        return (Color)target.GetValue(ColorBackProperty);
    }

    public static void SetColorBack(DependencyObject target, Color value)
    {
        target.SetValue(ColorBackProperty, value);
    }
}

You can then set these on any instance and access them in your template using normal Bindings (TemplateBindings won't work here):

<Button Content="Click Me" local:ColorExtensions.ColorFront="Red">
    <Button.Template>
        <ControlTemplate TargetType="Button">
            <Ellipse>
                <Ellipse.Fill>
                    <RadialGradientBrush RadiusX="1" RadiusY="1" GradientOrigin="0.7,0.8">
                        <GradientStop Color="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=(local:ColorExtensions.ColorFront)}" Offset="0"/>
                        <GradientStop Color="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=(local:ColorExtensions.ColorBack)}" Offset="1"/>
                    </RadialGradientBrush>
                </Ellipse.Fill>
            </Ellipse>
        </ControlTemplate>
    </Button.Template>
</Button>

Personally, I would just put the entire Brush into your template. This gives you much more control, later, as it allows you to change (via template changes) the brush from a radial gradient to a linear gradient, etc.