<Grid x:Name="CheatGrid">
  <Grid.Resources>
    <Storyboard x:Name="TransitionCheatOut">
      <DoubleAnimation From="0" To="-200" Storyboard.TargetProperty="(UIElement.RenderTransform).(TranslateTransform.X)" Storyboard.TargetName="CheatGrid" />
      <DoubleAnimation To="0" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="CheatGrid" />
    </Storyboard>
    <Storyboard x:Name="TransitionCheatIn">
      <DoubleAnimation From="200" To="0" Storyboard.TargetProperty="(UIElement.RenderTransform).(TranslateTransform.X)" Storyboard.TargetName="CheatGrid" />
      <DoubleAnimation To="1" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="CheatGrid" />
    </Storyboard>
  </Grid.Resources>
  <Grid.RenderTransform>
    <TranslateTransform />
  </Grid.RenderTransform>
  <!-- Insert your current cheat text stuff here --!>
</Grid>


// Call to begin transitioning to a new cheat
private void ShowCheat(int cheatId) {
    Action onTransitionOutComplete = null;
    onTransitionOutComplete = delegate {
        TransitionCheatOut.Complete -= onTransitionOutComplete;
        // Update the text blocks to contain the new cheat text
        TransitionCheatIn.Begin();
    };
    TransitionCheatOut.Complete += onTransitionComplete;
    TransitionCheatOut.Begin();
}