How to make a sandribbonbutton from XAML vector description?

I've got a class described in XAML as xiasma.icons.myusercontrol which looks a little like this:

<UserControl
	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
	xmlns:d="http://schemas.microsoft.com/expression/blend/2006" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
	x:Class=" xiasma.icons"
	x:Name="myusercontrol"
	Width="48" Height="48">

    <Grid x:Name="LayoutRoot">
        <Ellipse Margin="12,12,12,12" Stroke="#000000" StrokeThickness="2" x:Name="Circle">
            <Ellipse.Fill>
                <LinearGradientBrush StartPoint="1,0.8" EndPoint="0,0.5" SpreadMethod="Pad">
                    <GradientStop Color="#FF7C3D4C" Offset="0"/>
                    <GradientStop Color="#FFFD93AD" Offset="1"/>
                </LinearGradientBrush>
            </Ellipse.Fill>
        </Ellipse>
        <Path Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" StrokeThickness="7" Margin="18.5,12.5,18.5,12.5" Data="M0,8 L0,16" />
        <Path Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" StrokeThickness="7" Margin="12.5,18.5,12.5,18.5" Data="M8,8 L16,8" />
    </Grid>
</UserControl>

I want to populate a sandribbon group dynamically at runtime with each instance of the button being a different colour 

eg the "Circle" brush would be programmatically altered.

Now, I don't care what type xiasma.icons.myusercontrol is - it's a usercontrol so I could use the editor. But because the brush isn't known until runtime, I can't pre-render a bitmap to assign to the sandribbon.button.image property.

At the moment, I just add the usercontrols to the ribbongroup, but this isn't very good as the mouseover effects don't match those of "real" sandribbon buttons.

Am I doing something fundamentally wrong? 

Thanks in advance,

Adrian

An ellipse or a usercontrol is not reusable as an image. You should instead use a DrawingImage, setting its Drawing property to a DrawingGroup containing an ellipse primitive with the dynamic brush you spoke of. This can then be directly assigned to the Image property of one or more buttons.