XAML changes without effect

I'm trying to put a textblock in a grid element, but it doesn't display in the debug mode. What do I do wrong? Maybe it's caused that I manipulate the window directly by my C# code?

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsof开发者_如何学Got.com/winfx/2006/xaml"
        Title="MainWindow" Height="400" Width="500" ResizeMode="NoResize">
    <Window.Background>
        <ImageBrush ImageSource="/WpfApplication2;component/Images/Grass0118_22_S.jpg"></ImageBrush>
    </Window.Background>
    <Grid>
        <TextBlock Margin="10,10,0,0" Foreground="White" FontWeight="Bold">Życia:</TextBlock>
        <TextBlock Margin="50,10,0,0" Foreground="White" Text="{Binding Text, ElementName=points}"></TextBlock>
    </Grid>
</Window>

Try this

<Grid>
    <Stackpanel Orientation = "Horizontal">
        <TextBlock Margin="10,10,0,0" Foreground="White" FontWeight="Bold">Życia:</TextBlock>
        <TextBlock Margin="50,10,0,0" Foreground="White" Text="{Binding Text, ElementName=points}"></TextBlock>

  </Stackpanel>

</Grid>

I've already solved my issue. I had defined a canvas tag in my C# code and it overwrote the XAML changes. I replaced the XAML code to the following

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="400" Width="500" ResizeMode="NoResize">
    <Window.Background>
        <ImageBrush ImageSource="/WpfApplication2;component/Images/Grass0118_22_S.jpg"></ImageBrush>
    </Window.Background>
    <Canvas>
        <Grid>
            <TextBlock Margin="10,10,0,0" Foreground="White" FontWeight="Bold">Życia:</TextBlock>
            <TextBlock Margin="50,10,0,0" Foreground="White" Text="{Binding Text, ElementName=points}"></TextBlock>
        </Grid>
        <Canvas Name="mycanvas"></Canvas>
    </Canvas>
</Window>

and removed the line creating the canvas element from my C# code and everything works now. Thanks!