VB.NET - XML Daten lesen und in DataGrid schreiben

<UserControl x:Class="UserControlEbenenTemplates"  
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"   
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"   
             xmlns:local="clr-namespace:PROCESS_MX_Regalerstellung"  
             mc:Ignorable="d"   
             d:DesignHeight="450" d:DesignWidth="800">  
    <Grid Background="#D7E2F7" ShowGridLines="False">  
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="220"/>  
            <ColumnDefinition Width="*"/>  
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="35"/>  
            <RowDefinition Height="30"/>  
            <RowDefinition Height="30"/>  
            <RowDefinition Height="*"/>  
            <RowDefinition Height="30"/>  
            <RowDefinition Height="*"/>  
        </Grid.RowDefinitions>
        <Label VerticalContentAlignment="Center"  FontWeight="Bold" Margin="0,7,0,3" x:Name="Lbl_EbeneSelected"  Content="{Binding ID, Mode = OneWay}" Grid.Column="0"  Grid.Row="0"/>  
        <StackPanel Margin="0,7,0,3" Orientation="Horizontal" Grid.Column="1"  Grid.Row="0">  
            <Label VerticalContentAlignment="Center" Content="ID"  FontWeight="Bold" Margin="0,0,0,0"/>  
            <TextBox x:Name="TxBx_ID" Width="120" VerticalContentAlignment="Center" Text="{Binding ID, Mode = TwoWay}"/>  
        </StackPanel>
        <ListView  x:Name="TemplateItems" IsSynchronizedWithCurrentItem="True"  VerticalAlignment="Stretch" Margin="8,3,8,8" Grid.Column="0" Grid.Row="1" Grid.RowSpan="5">  
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="ID"  DisplayMemberBinding="{Binding ID}" />  
                </GridView>
            </ListView.View>
            <ListBox.ContextMenu>
                <ContextMenu>
                    <MenuItem Header="Löschen" Name="CmDelete" Click="BtnDelete_Click"/>  
                    <MenuItem Header="Neu" Name="CmNew" Click= "BtnAdd_Click"/>  
                </ContextMenu>
            </ListBox.ContextMenu>
        </ListView>

        <Label Content="Lagerplätze" VerticalAlignment="Center" Grid.Column="1" Grid.Row="1" FontWeight="Bold"/>  
        <StackPanel Orientation="Horizontal" VerticalAlignment="Stretch" Margin="217,0,3,0" Grid.Row="2" Grid.ColumnSpan="2">  
            <Button Name="BtnLpAdd" Width="100" Margin="3" Content="LP einfügen"></Button>  
            <Button Name="BtnLpDel" Width="100" Margin="3" Content="LP löschen"></Button>  
            <Button Name="BtnLpUp" Width="100" Margin="3" Content="LP nach oben"></Button>  
            <Button Name="BtnLpDown" Width="100" Margin="3" Content="LP nach unten"></Button>  
        </StackPanel>
        <DataGrid x:Name="DG_Lagerplaetze" Margin="217,10,11,25" Grid.Row="3" HorizontalAlignment="Stretch" AutoGenerateColumns="False" AlternatingRowBackground="#fadb92" AlternationCount="2" Grid.ColumnSpan="2" Grid.RowSpan="2" >  
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding Name}" Header="Name" />  
                <DataGridTextColumn Binding="{Binding Index}" Header="Index" />  
                <DataGridComboBoxColumn x:Name="BEMASSUNG" SelectedItemBinding="{Binding Bemassung}" Header="Bemassung" >  
                    <DataGridComboBoxColumn.EditingElementStyle>
                        <Style TargetType="ComboBox">  
                            <Setter Property="IsDropDownOpen" Value="True" />  
                        </Style>
                    </DataGridComboBoxColumn.EditingElementStyle>
                </DataGridComboBoxColumn>
                <DataGridTextColumn Binding="{Binding Teilebene}" Header="Teilebene" />  
                <DataGridTextColumn Binding="{Binding Teilplatz}" Header="Teilplatz" />  
                <DataGridTextColumn Binding="{Binding Lp}" Header="Lagerplatzcode" />  
                <DataGridTextColumn Binding="{Binding EP_X}" Header="EP-X" />  
                <DataGridTextColumn Binding="{Binding EP_Y}" Header="EP-Y" />  
                <DataGridTextColumn Binding="{Binding ADD_Z}" Header="ADD-Z" />  
                <DataGridComboBoxColumn x:Name="DGPLATZTYP" SelectedItemBinding="{Binding Platztyp}" Header="Platztyp" >  
                    <DataGridComboBoxColumn.EditingElementStyle>
                        <Style TargetType="ComboBox">  
                            <Setter Property="IsDropDownOpen" Value="True" />  
                        </Style>
                    </DataGridComboBoxColumn.EditingElementStyle>
                </DataGridComboBoxColumn>
            </DataGrid.Columns>
        </DataGrid>
        <Label VerticalContentAlignment="Center"  VerticalAlignment="Center"  FontWeight="Bold" Grid.Column="1" Grid.Row="4" x:Name="Lbl_Darstellung" Content="Graphische Darstellung"/>  
        <Border Grid.Column="1" Grid.Row="5" Margin="0,0,8,8"  BorderBrush="Gray" BorderThickness="1">  
            <Canvas x:Name="CanvasDraw" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"  Background="WhiteSmoke"/>  
        </Border>
    </Grid>
</UserControl>

<Page x:Class="Page_LeftContent"  
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"   
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"   
      xmlns:local="clr-namespace:PROCESS_MX_Regalerstellung"  
      mc:Ignorable="d"   
      d:DesignHeight="450" d:DesignWidth="800"  
      Title="Page_LeftContent">  
    <Grid>
        <StackPanel Margin="0,20,0,0" HorizontalAlignment="Center"  Orientation="Vertical">  
            <Button  Width="130" Margin="5,2,5,2" Name="BtnOpenXml" Content="Xml Datei öffnen"></Button>  
            <Button  Width="130" Margin="5,2,5,2" Name="BtnSaveXml" Content="Xml Datei speichern"></Button>  
        </StackPanel>
    </Grid>
</Page>