public void OpenTrainingWindow(Patient _currentPatient, Training _selectedTraining) { //OpenningWindow.Children.Clear(); //OpenningWindow.Background = null; using (TrainingMenu _trainingMenu = new TrainingMenu(_currentPatient, _selectedTraining)) { _trainingMenu.MainWindow = this; _trainingMenu.CloseApp += CloseApp; _trainingMenu.LogOut += LogOut; this.Content = _trainingMenu; //OpenningWindow.Children.Add(_trainingMenu); } }