Vista - which controls in VisualBrush.Visual

Hallo Guys,
I'm a newbe ti WPF but I'd like to know better how could I fill
Geometry3D materials. I succesfully used videos and images, when try
with frames or pages nothing appear. (code snippet below. Coding
Expression ID aided)
I read that VisualBrush interaction is missing for v1, but seems to me
rendering too for these kind of control or I (probabily) missed
something.
Can you give me some advices ?

Alberto

<GeometryModel3D x:Name="OB_Plane1">
<GeometryModel3D.Material>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<VisualBrush TileMode="Tile" Stretch="Uniform">
<VisualBrush.Visual>

<Frame Source="someURL"/>

</VisualBrush.Visual>
</VisualBrush>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</GeometryModel3D.Material>
<GeometryModel3D.Geometry>
<MeshGeometry3D x:Name="ME_Plane1" Positions="3.609293,1,0 -1,1,0
-1,-1,0 3.609293,-1,0" Normals="0,0,1 0,0,1 0,0,1 0,0,1"
TextureCoordinates="0,1 1,1 1,0" TriangleIndices="0 1 2 0 2 3"/>
</GeometryModel3D.Geometry>
<GeometryModel3D.Transform>
<Transform3DGroup>
<TranslateTransform3D OffsetZ="0" OffsetY="0" OffsetX="0"/>
<ScaleTransform3D ScaleX="1" ScaleY="2" ScaleZ="1.5"/>
<RotateTransform3D
d:EulerAngles="110.313458565114,78.6415164961732,91.0743385978702">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D
Axis="0.254387077339354,0.964803071106845,-0.0666501977907248"
Angle="94.194270424737326"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<TranslateTransform3D OffsetZ="0" OffsetY="0" OffsetX="0"/>
<TranslateTransform3D OffsetZ="3.5915406294298715" OffsetY="0"
OffsetX="-10.607040559207691"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>