Maintain WPF Window Size across different resolution monitors

Good Day

I am building a Kinect Applications. So i am using WPF on my laptop with the resolution of

1920 * 1080

so everything looks great and last night , i wanted to test it on my Samsung HD TV 42 inch Plasma and my Buttons went missing.

So my TV resolution is 1024 x 768(NATIVE)

so i reduced my resolution to 1024 x 768 on my laptop and i experienced the same thing my TV was experiencing.

I need an Advice to adjust my apps layout to accommodate all resolutions from

1024 x 768(NATIVE) and higher resolution.

Here is an example of a Page that i have , so basically i am using navigation service i have one window that hold the frame and i make it full-screen and others are just pages.

Code:

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<Page x:Class="SchoolPlay1.MainMenu"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:local="clr-namespace:Microsoft.Samples.Kinect.ControlsBasics"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
        xmlns:k="http://schemas.microsoft.com/kinect/2013"
        xmlns:tk="clr-namespace:Microsoft.Kinect.Toolkit;assembly=Microsoft.Kinect.Toolkit" 
    KeepAlive="false"
      Height="1008.94" Width="2086.684"
        Title="MainMenu">
    <Page.Background>
        <ImageBrush ImageSource="/SchoolPlay1;component/Background/Background_Math.png" />
    </Page.Background>
    <Grid Canvas.Top="-16" x:Name="LayoutRoot" Width="1636">

        <Grid Grid.Row="0"  Margin="10,0,0,19.6">
            <k:KinectUserViewer k:KinectRegion.KinectRegion="{Binding ElementName=kinectRegion}" Height="100" HorizontalAlignment="Center" VerticalAlignment="Top" />
        </Grid>

        <k:KinectRegion x:Name="kinectRegion" Margin="-226,10,-224,6.8" HorizontalAlignment="Right" Width="2086">
            <Grid x:Name="kinectRegionGrid" Margin="10,20,160,19.8">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                    <RowDefinition Height="170" />
                </Grid.RowDefinitions>


                <k:KinectTileButton  x:Name="btnAlphabets"    Canvas.Left="386"  Width="Auto" Height="Auto" Canvas.Top="98"  Click="btnAlphabets_Click" Background="{x:Null}" BorderBrush="{x:Null}" Margin="29,53,1521.4,153.4">
                    <Image Source="/SchoolPlay1;component/MainMenuImages/Final_Alphabet.png" Height="426" Width="342"  />
                </k:KinectTileButton>


                <k:KinectTileButton  x:Name="btnMath" Width="Auto" Height="Auto"  Canvas.Top="98"  Click="btnMath_Click" Canvas.Left="10" Background="{x:Null}" BorderBrush="{x:Null}" Margin="400,53,1137.4,153.4">
                    <Image Source="MainMenuImages/MathMenu.png" Height="429" Width="352"  />
                </k:KinectTileButton>

                <k:KinectTileButton  x:Name="btnFruitAndVeg"    Canvas.Left="702"  Canvas.Top="117" Width="Auto" Height="Auto"  Click="btnFruitAndVeg_Click_1" Background="{x:Null}" BorderBrush="{x:Null}" Margin="810,109,783.4,153.4">
                    <Image Source="MainMenuImages/FruitAndVegMenu.png" Height="386" Width="302"  />
                </k:KinectTileButton>
                <k:KinectTileButton  x:Name="btnMiscellaneouss"      Width="Auto" Height="Auto"  Background="{x:Null}" BorderBrush="{x:Null}" Margin="1161,141,431.4,198.4" Click="btnMiscellaneouss_Click" IsEnabled="False"  >
                    <Image Source="MainMenuImages/Miscellaneous_Menu.png" Height="526" Width="302"  />
                </k:KinectTileButton>
                <k:KinectTileButton    Background="{x:Null}" BorderBrush="{x:Null}"  x:Name="btnBack"      Click="btnBack_Click"  Height="Auto" Width="Auto" Margin="-212,257,211.4,-88" Grid.RowSpan="2"  >

                    <Image Source="NavigationButtons/Back.png" Height="200" Width="500"  />
                </k:KinectTileButton>

            </Grid>
        </k:KinectRegion>
        <tk:KinectSensorChooserUI HorizontalAlignment="Center" VerticalAlignment="Top" x:Name="sensorChooserUi" Margin="461,10,538,0" />
     
    </Grid>
</Page>

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Thanks