public void setMainApp(Main app) {
      this.app = app;
      
      try {
	        FXMLLoader loader1 = new FXMLLoader(app.getClass().getResource("/MitarbeiterSpalte.fxml"));
	        AnchorPane contentPage1 = (AnchorPane) loader1.load();
	        FXMLLoader loader2 = new FXMLLoader(app.getClass().getResource("/MitarbeiterSpalte.fxml"));
	        AnchorPane contentPage2 = (AnchorPane) loader2.load();
	        FXMLLoader loader3 = new FXMLLoader(app.getClass().getResource("/MitarbeiterSpalte.fxml"));
	        AnchorPane contentPage3 = (AnchorPane) loader3.load();
	        FXMLLoader loader4 = new FXMLLoader(app.getClass().getResource("/MitarbeiterSpalte.fxml"));
	        AnchorPane contentPage4 = (AnchorPane) loader4.load();
	        FXMLLoader loader5 = new FXMLLoader(app.getClass().getResource("/MitarbeiterSpalte.fxml"));
	        AnchorPane contentPage5 = (AnchorPane) loader5.load();

	        // or convenience methods set more than one constraint at once...
	        GridPane.setConstraints(contentPage1, 0, 0);
	        dienstplanRaster.getChildren().addAll(contentPage1);
	        GridPane.setConstraints(contentPage2, 0, 1);
	        dienstplanRaster.getChildren().addAll(contentPage2);
	        GridPane.setConstraints(contentPage3, 0, 2);
	        dienstplanRaster.getChildren().addAll(contentPage3);
	        GridPane.setConstraints(contentPage4, 0, 3);
	        dienstplanRaster.getChildren().addAll(contentPage4);
	        GridPane.setConstraints(contentPage5, 0, 4);
	        dienstplanRaster.getChildren().addAll(contentPage5);
	        
	        // Give the controller access to the main app
		    //MainDienstplanController controller = loader.getController();
		    //controller.setMainApp(app);
		    
	        //root.setCenter(contentPage);
			
			//mainScene = new Scene(root,1024,768);
			//mainScene.getStylesheets().add(app.getClass().getResource("application.css").toExternalForm());
		} catch(Exception e) {
			e.printStackTrace();
		}
      
      // Add observable list data to the table
      // diensteTable.setItems(this.app.getDiensteData());
      
  }