How to open new usercontrol in WPF VB.NET

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VB

.NET

WPF

Hi folks
I wrote a program which opens my second UserControl in the main window. The program runs in visual studio but the result doesn't work. I mean when you click on the button, it doesn't open the second window.
Any kindly help please?
Thanks.

What I have tried:

The code of MainWindow in XAML

<Window x:Name="TheMainWindow" x:Class="MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:SRT2Nuendo"
        mc:Ignorable="d"
        Title="MyMainWindow"
        Width="1000"
        Height="600"
        WindowStartupLocation="CenterScreen"
        HorizontalAlignment="Center"
        VerticalAlignment="Center"
        WindowStyle="None"
        AllowsTransparency="True"
        BorderThickness="3"
        AllowDrop="False">
    <Grid
        <ContentControl x:Name="CC"/>
    </Grid>
</Window>

The code of MainWindow in VB.NET

Class MainWindow
    Sub New()
        InitializeComponent()
        CC.Content = New UserControlMain1
    End Sub
End Class

This is code of UserControlPlatform in XAML

<UserControl x:Name="ucMain1" x:Class="UserControlMain1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MainWindow"
        mc:Ignorable="d"
        Width="1000"
        Height="600"
        HorizontalAlignment="Center"
        VerticalAlignment="Center"
        BorderThickness="3"
        AllowDrop="False">
    <Grid
        <Button x:Name="btnOpenNewUC"/>
    </Grid>
</UserControl>

This is code of UserControlMain1 in VB.NET

Public Class UserControlMain1
   Private Sub btnOpenNewUC_Click(sender As Object, e As RoutedEventArgs) Handles btnOpenNewUC.Click
        Dim NewUC = New MainWindow
        NewUC.CC.Content = New UserControlMain2
   End Sub
End Class

This is Code of UserControlMain2 in XAML

<UserControl x:Name="ucMain2" x:Class="UserControlMain2"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MainWindow"
        mc:Ignorable="d"
        Width="1000"
        Height="600"
        HorizontalAlignment="Center"
        VerticalAlignment="Center"
        BorderThickness="3"
        AllowDrop="False">
    <Grid
        <Label x:Name="lbHello" Text="HELLO WORLD!"/>
    </Grid>
</UserControl>