How to create screen keyboard C# wpf

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C#

Visual-Studio

WPF

keyboard

Hello everyone,
I have an issue implementing a screen keyboard for a touch app, i need an usercontrol (for dragabble purposes) in wpf that don't steal focus from others inputs and keep it itselft always on top.

To do that i create a window whit {x:null} background and i put the usercontrol inside, then i show the window in the start of the app and i can view the "invisible" window whit the keyboard allways on top, and i can drag and drop the keyboard over the invisible window, the only problem is that i cant prevent stealing focus from other inputs, so i can't use the keyboard.

I hope you can help me.
Sorry for my bad english.

Thanks!

Matías

Here is the control XAML, it only has 3 buttons for test purposes.

<UserControl x:Class="SuperCajero.TecladoCompleto"
             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" 
             mc:Ignorable="d"
             d:DesignHeight="200" d:DesignWidth="1024" Focusable="False">
    <Grid Width="1024" Height="200" removed="Green" Focusable="False">
        <Button Content="A" Height="35" HorizontalAlignment="Left" Margin="471,92,0,0" Name="btnA" VerticalAlignment="Top" Width="35"  Click="btnA_Click" Focusable="False"/>
        <Button Content="B" Height="35" HorizontalAlignment="Left" Margin="219,100,0,0" Name="btnB" VerticalAlignment="Top" Width="35"  Click="btnB_Click" Focusable="False"/>
        <Button Content="C" Height="35" HorizontalAlignment="Left" Margin="366,100,0,0" Name="btnC" VerticalAlignment="Top" Width="35"  Click="btnC_Click" Focusable="False"/>
    </Grid>
</UserControl>

Here is the C# code of the control that makes it draggable inside the auxiliar window

public partial class TecladoCompleto : UserControl
    {
        public TecladoCompleto()
        {
            InitializeComponent();
            MakeDraggable(this, this);
        }

        public void MakeDraggable(System.Windows.UIElement moveThisElement, System.Windows.UIElement movedByElement)
        {
            bool isMousePressed = false;
            System.Windows.Media.TranslateTransform transform = new System.Windows.Media.TranslateTransform(0, 0);
            moveThisElement.RenderTransform = transform;
            System.Windows.Point originalPoint = new System.Windows.Point(0, 0), currentPoint;

            movedByElement.MouseLeftButtonDown += (a, b) =>
            {
                isMousePressed = true;
                originalPoint = ((System.Windows.Input.MouseEventArgs)b).GetPosition(moveThisElement);
            };

            movedByElement.MouseLeftButtonUp += (a, b) => isMousePressed = false;
            movedByElement.MouseLeave += (a, b) => isMousePressed = false;
            movedByElement.MouseMove += (a, b) =>
            {
                if (!isMousePressed) return;

                currentPoint = ((System.Windows.Input.MouseEventArgs)b).GetPosition(moveThisElement);

                transform.X += currentPoint.X - originalPoint.X;
                transform.Y += currentPoint.Y - originalPoint.Y;
            };
        }

        private void btnA_Click(object sender, RoutedEventArgs e)
        {
            WindowsInput.InputSimulator.SimulateKeyDown(WindowsInput.VirtualKeyCode.VK_A);
        }

        private void btnB_Click(object sender, RoutedEventArgs e)
        {
            WindowsInput.InputSimulator.SimulateKeyDown(WindowsInput.VirtualKeyCode.VK_B);
        }

        private void btnC_Click(object sender, RoutedEventArgs e)
        {
            WindowsInput.InputSimulator.SimulateKeyDown(WindowsInput.VirtualKeyCode.VK_C);
        }
    }

Here is the auxiliar transparent window that owns the usercontrol

<Window x:Class="SuperCajero.AuxWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:controls="clr-namespace:SuperCajero"
        Title="AuxWindow" WindowStyle="None" Topmost="True" AllowsTransparency="True" removed="{x:Null}" Focusable="False" >
    <Grid>
        <controls:TecladoCompleto HorizontalAlignment="Center" VerticalAlignment="Bottom" Focusable="False"/>
    </Grid>
</Window>