Остановка выполнения скрипта при нажатии на кнопку Cancel

Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
 
$form = New-Object System.Windows.Forms.Form
$form.Text = 'Test'
$form.Size = New-Object System.Drawing.Size(300,160)
$form.StartPosition = 'CenterScreen'
 
$OKButton = New-Object System.Windows.Forms.Button
$OKButton.Location = New-Object System.Drawing.Point(40,70)
$OKButton.Size = New-Object System.Drawing.Size(75,23)
$OKButton.Text = 'OK'
$OKButton.DialogResult = [System.Windows.Forms.DialogResult]::OK
$form.AcceptButton = $OKButton
$form.Controls.Add($OKButton)
 
$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Point(170,70)
$CancelButton.Size = New-Object System.Drawing.Size(75,23)
$CancelButton.Text = 'Cancel'
$CancelButton.DialogResult = [System.Windows.Forms.DialogResult]::Cancel
$form.CancelButton = $CancelButton
$form.Controls.Add($CancelButton)
 
$label = New-Object System.Windows.Forms.Label
$label.Location = New-Object System.Drawing.Point(10,20)
$label.Size = New-Object System.Drawing.Size(280,20)
$label.Text = 'Edit'
$form.Controls.Add($label)
 
$textBox = New-Object System.Windows.Forms.TextBox
$textBox.Location = New-Object System.Drawing.Point(10,40)
$textBox.Size = New-Object System.Drawing.Size(260,20)
$form.Controls.Add($textBox)
 
 
$form.Topmost = $true
 
$form.Add_Shown({$textBox.Select()})
$result = $form.ShowDialog()
 
if ($result -eq [System.Windows.Forms.DialogResult]::OK)
{
    $x = $textBox.Text
    $x
}

$CancelButton.add_click(
{
$form.close()
})

$CancelButton.add_click(
{
Stop-Process -Id $PID
})

$result = $form.ShowDialog()

if ($result -eq [System.Windows.Forms.DialogResult]::OK)
{
$x = $textBox.Text
$x
}

Add-Type -TypeDefinition @" 
 
// "
using System;
using System.Windows.Forms;
public class Win32Window : IWin32Window
{
    private IntPtr _hWnd;
    private int _data;
 
    public int Data
    {
        get { return _data; }
        set { _data = value; }
    }
 
    public Win32Window(IntPtr handle)
    {
        _hWnd = handle;
    }
 
    public IntPtr Handle
    {
        get { return _hWnd; }
    }
}
 
"@ -ReferencedAssemblies 'System.Windows.Forms.dll'
 
$caller = new-object Win32Window -ArgumentList ([System.Diagnostics.Process]::GetCurrentProcess().MainWindowHandle)
 
# PromptAuto -  форма 
PromptAuto -Title $title -Message $message -caller $caller
# ждет
$result = $caller.Data
Write-Debug ("Result is : {0} ({1})" -f $Readable.Item($result),$result)