How to Drag the Window along with the mouse click in WPF

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WPF

Hi CP,
I am trying to create a On Screen / Virtual keyboard, and I would like to do so in WPF..I have craeted my layout etc, and I have managed to get my onscreen Keyboard working..The problem I have is that when I Click and Drag My Virtual keyboard its not coming along with the mouse..It just got dragged after I release the mouse click..Is there a way I can clear up this problem,in the same way that the MS OSK works?

Note:
Later I will use this project in Touch Screen..So i don't need to use Mouse Click Events..

Here is my Sample Code,,

[DllImport("user32.dll")]
public static extern int SetWindowLong(IntPtr hWnd, int nIndex,
                                                  IntPtr dwNewLong);

[DllImport("user32.dll", SetLastError = true)]
public static extern UInt32 GetWindowLong(IntPtr hWnd, int nIndex);


public Window1()
{
    InitializeComponent();
    this.Topmost = true;
}


private void Window_Loaded(object sender, RoutedEventArgs e)
{
    IntPtr HWND = new WindowInteropHelper(this).Handle;
    const int GWL_EXSTYLE = (-20);

    GetWindowLong(HWND, GWL_EXSTYLE);
    SetWindowLong(HWND, GWL_EXSTYLE, (IntPtr)(0x8000000));

}

private void AllButton_Click(object sender, RoutedEventArgs e)
{
    String tempstring = "";

    try
    {
        e.Handled = true;
        tempstring = ((Button)sender).CommandParameter.ToString();

        System.Windows.Forms.SendKeys.SendWait(tempstring);
    }
    catch (Exception ex)
    {
        System.Windows.Forms.MessageBox.Show(ex.ToString());
    }
}