Почему не отображаются элементы страниц, а пишет communitytoolkit.mvvm.input.relaycommand?

Что нужно сделать чтобы исправить?

    namespace MyWallet.ViewModel

{

internal class MainViewModel : ViewModedBase

{
    private Page CashAccPage = new CashAcc();
    private Page InfoChartsPage = new InfoCharts();
    private Page MainMenuPage = new MainMenu();

    private Page _CurPage = new MainMenu();

    public Page CurPage
    {
        get => _CurPage;
        set => Set(ref _CurPage, value);
    }

    public ICommand OpenMainPage
    {
        get
        {
            return new RelayCommand(()=> CurPage = MainMenuPage);
        }
    }
    public ICommand OpenCashAccPage
    {
        get
        {
            return new RelayCommand(() => CurPage = CashAccPage);
        }
    }
    public ICommand OpenInfoChartsPage
    {
        get
        {
            return new RelayCommand(() => CurPage = InfoChartsPage);
        }
    }
}

}

namespace MyWallet.ViewModel

{

internal abstract class ViewModedBase : INotifyPropertyChanged

{
    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void onPropertyChanged([CallerMemberName] string PropertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(PropertyName));
    }
    protected virtual bool Set<T>(ref T field, T value, [CallerMemberName] string PropertyName = null)
    {
        if (Equals(field, value)) return false;
        field = value;
        onPropertyChanged(PropertyName);
        return true;
    }
}

}

И собственно сами кнопки которые должны переключать страницы

                <StackPanel Orientation="Vertical" Background="Transparent">
                <Button Content="Главная" Template="{StaticResource ResourceKey=LeftMenu}" Command="{Binding OpenMainPage}"/>
                <Button Content="Счета" Template="{StaticResource ResourceKey=LeftMenu}" Command="{Binding OpenCashAccPage}"/>
                <Button Content="Графики" Template="{StaticResource ResourceKey=LeftMenu}" Command="{Binding OpenInfoChartsPage}"/>
                <Button Content="Валюта" Template="{StaticResource ResourceKey=LeftMenu}"/>
                <Button Content="Регулярные платежи" Template="{StaticResource ResourceKey=LeftMenu}"/>
                <Button Content="Настройки" Template="{StaticResource ResourceKey=LeftMenu}"/>
            </StackPanel>