private void OpenChangeLevelDialog_Execute()
{
View = new LevelView();
View.Window.Closing += UpdateChangeLevel;
View.ShowView(new LevelViewViewModel(SelectedLevel));
}
private void OpenAddLevelDialog_Execute()
{
View = new LevelView();
View.Window.Closing += ClosingLevelDialog;
View.ShowView(new LevelViewViewModel(Levels));
}