Powershell: Form Window Event Minimize und Maximize

function formObject {
	[System.Reflection.Assembly]::LoadWithPartialName('System.Drawing') | Out-Null  
	[System.Reflection.Assembly]::LoadWithPartialName('System.Windows.Forms') | Out-Null  

	[System.Windows.Forms.Application]::EnableVisualStyles()
	$mainWindow = New-Object System.Windows.Forms.Form
	$mainWindow.Size = New-Object System.Drawing.Size(550,445)
	$mainWindow.FormBorderStyle = 'FixedDialog'  
	$mainWindow.Text = 'Test Form'  
	$mainWindow.StartPosition = 'CenterScreen'  
	$mainWindow.MaximizeBox = $false
	$mainWindow.ShowInTaskbar = $false

  $notifyIcon = New-Object System.Windows.Forms.NotifyIcon
	$notifyIcon.Icon = [System.Drawing.SystemIcons]::Information
  $notifyIcon.BalloonTipText = "Test Tip Text"  
  $notifyIcon.BalloonTipTitle = "Test Title Text"  
  $notifyIcon.Visible = $true
  $notifyIcon.Add_MouseDoubleClick({
    if ($_.Button -eq [System.Windows.Forms.MouseButtons]::Left){
      $mainWindow.WindowState = "Normal"  
      $mainWindow.Opacity = 100
    }
  })
  $mainWindow.Add_FormClosing({
    $notifyIcon.Dispose()
  })
  $mainWindow.add_Resize({
    if ($mainWindow.WindowState -eq [System.Windows.Forms.FormWindowState]::Minimized){
        $mainWindow.Opacity = 0 
    }
})
  
  $mainWindow.ShowDialog() | Out-Null
}
formObject