Show Notification in Wpf

I want to show a grid that involve a label and I want to show this in left-above of another grid.the wpf code(xml) is this :

<Grid.Triggers>
            <EventTrigger RoutedEvent="FrameworkElement.Loaded">
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleY)" >
                            <SplineDoubleKeyFrame KeyTime="0:0:0" Value="0"/>
                            <SplineDoubleKeyFrame KeyTime="0:0:0.5" Value="1"/>
                        </DoubleAnimationUsingKeyFrames>
                        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)">
                            <SplineDoubleKeyFrame KeyTime="0:0:2" Value="1"/>
                            <SplineDoubleKeyFrame KeyTime="0:0:5" Value="0"/>
                        </DoubleAnimationUsingKeyFrames>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger>
        </Grid.Triggers>
        <Grid.RenderTransform>
        <ScaleTransform ScaleY="1" />

</Grid>

How to create this notification when press a button? I have the C# code for this. thanks.