这份原稿.微:组合框没有被填充

我有一个WPF应用程序与Caliburn.Micro。我试图填充我刚刚添加的新组合框，但它保持空，尽管同一视图上的其他组合框已填充。我进行了调试，因此我知道ViewModel中的GeorgaphyNames源集合是正确填充的。你能帮帮我吗?

下面是我的代码:

模型:

public class GeographyName : PropertyChangedBase
{
    private string _name;
    public string Name
    {
        get { return _name; }
        set
        {
            if (_name == value) return;
            _name = value;
            NotifyOfPropertyChange(() => Name);
        }
    }
  ...
}

视图:

            <ComboBox Grid.Row="6" Grid.Column="1" Name="GeographyNames" DisplayMemberPath="Name" SelectedValuePath="Name" SelectedItem="SelectedGeographyName" Style="{StaticResource DetailCombo}" />

ViewModel:

    private BindableCollection<GeographyName> _geographyNames;
    public BindableCollection<GeographyName> GeorgaphyNames
    {
        get { return _geographyNames; }
        private set
        {
            if (_geographyNames == value)
                return;
            _geographyNames = value;
            NotifyOfPropertyChange(() => GeorgaphyNames);
        }
    }

    private GeographyName _selectedGeographyName;
    public GeographyName SelectedGeographyName
    {
        get { return _selectedGeographyName; }
        set
        {
            if (_selectedGeographyName == value)
                return;
            _selectedGeographyName = value;
            NotifyOfPropertyChange(() => SelectedGeographyName);
            IsModified = true;
        }
    }

在更改另一个组合框中的选择时填充该组合框:

    private Ldc _selectedLdc;
    public Ldc SelectedLdc
    {
        get { return _selectedLdc; }
        set
        {
            if (_selectedLdc == value)
                return;
            _selectedLdc = value;
            NotifyOfPropertyChange(() => SelectedLdc);
            if (SelectedLdc != null)
            {
                GeorgaphyNames = GeographyName.GetData(SelectedLdc.LdcId);
            }
            IsModified = true;
        }
    }