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#region OnButtonClick
        /// <summary>Handles the event of a button being clicked.</summary>
        /// <param name="sender">The sender of the event.</param>
        /// <param name="e">The arguments of the event.</param>
        private void OnButtonClick(object sender, RoutedEventArgs e)
        {
            InstallData.IsBusy = true;
            Button btn = sender as Button;

            if (btn != null && btn.Content != null && Bootstrapper != null && Bootstrapper.Engine != null)
            {
                switch (btn.Content.ToString().ToUpperInvariant())
                {
                    case "Anwendung A installieren": 
                    { 
                        Bootstrapper.Engine.Plan(Wix.LaunchAction.Install); 
                    } 
                    break;

                    case "Anwendung B installieren": 
                    { 
                        Bootstrapper.Engine.Plan(Wix.LaunchAction.Install); 
                    } 
                    break;


                    case "UNINSTALL": { Bootstrapper.Engine.Plan(Wix.LaunchAction.Uninstall); } break;
                    case "QUIT": { Close(); } break;
                    default: break;
                }
            }
            else { InstallData.IsBusy = false; }
        }