can't render the buttons on the entire display in SLXNA - silverlight

Question

I have a SLXNA game and am trying to display a menu on the SL part. The problem is that the buttons seem to display but not entirely. In a certain part of the screen the buttons just stop to be drawn(i can see tje button till a point where it looks like it gets 'cut off'). What could be the problem?
note: the app is in landscape and is a default SL/XNA template
here is the code(i will only display the code that interests us):
XAML :
</Grid.RowDefinitions>
<!-- Toggles the visibility of the ColorPanel -->
<Button VerticalAlignment="Top" BorderBrush="DarkRed" Foreground="DarkRed" Margin="1,0,-1,0">pause</Button>
<Button VerticalAlignment="Bottom" BorderBrush="DarkRed" Foreground="DarkRed" Margin="1,0,-1,0">change</Button>
<!-- Arrange buttons in a horizontal line by using StackPanel -->
</Grid>
i declare :
UIElementRenderer elementRenderer;
public GamePage()
{
// some typical code.....
LayoutUpdated += new EventHandler(GamePage_LayoutUpdated);
}
void GamePage_LayoutUpdated(object sender, EventArgs e)
{
// Create the UIElementRenderer to draw the XAML page to a texture.
// Check for 0 because when we navigate away the LayoutUpdate event
// is raised but ActualWidth and ActualHeight will be 0 in that case.
if (ActualWidth > 0 && ActualHeight > 0 && elementRenderer == null)
{
elementRenderer = new UIElementRenderer(this, (int)ActualWidth, (int)ActualHeight);
}
}
private void OnDraw(object sender, GameTimerEventArgs e)
{
SharedGraphicsDeviceManager.Current.GraphicsDevice.Clear(Color.LightGoldenrodYellow);
// draw some 3d objects
elementRenderer.Render();
spriteBatch.Begin();
spriteBatch.Draw(elementRenderer.Texture, Vector2.Zero, Color.White);
spriteBatch.End();
// TODO: Add your drawing code here
}

Answer 1

I've seen this before. I think the problem here is that because your page is Landscape it actually gets created first by Silverlight as Portrait and then "rotated" around - leaving your UIElementRenderer with the wrong size and everything looking wrong.
Try recreating your UIElementRenderer in response to the OrientationChanged event. (i.e. call the code you have in the GamePage_LayoutUpdated method again)