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private Page name1;
private Page name2;
 
private Page _currentPage;
public Page CurrentPage
{
    get
    {
        return _currentPage;
    }
    
    set
    {
        _currentPage = value;
        RaisePropertyChanged(nameof(CurrentPage));
    }
}
 
private double _frameOpacity;
public double FrameOpacity
{
    get
    {
        return _frameOpacity;
    }
    set
    {
        _frameopacity = value;
        RaisePropertyChanged(nameof(FrameOpacity))
    }
}
        public MainViewModel()
        {
            name1 = new name1();
            name2 = new name2();
        
            FrameOpacity = 1;
            CurrentPage = name1;
        }
 
        public ICommand Name1Btn_Click
        {
            
            get
            {
                return new RelayCommand(() => SlowOpacity(name1));
            }
        }
 
        public ICommand Name2Btn_Click
        {
            get
            {
                return new RelayCommand(() => SlowOpacity(name2));
            }
        }
    
    
private async void SlowOpacity(Page page)
{
    await Task.Factory.Startnew(() =>
    {
        CurrentPage = page; //Универсальный метод для всех наших страниц
        
        for(double i = 0.0; i < 1.1; i += 0.1)
        {
            FrameOpacity = i;
            Thread.Sleep(15);
        }
    }
}