绑定到列表框的组合框数据不会显示显示成员

我有一个组合框，用于填充数据库中的数据，根据列表框的选择，通过SQL查询填充给定列表框中的数据。问题是显示成员属性不会显示。我不会显示后端sql，因为它工作得很好，而且列表框实际上只填充了显示成员。因此，列表框中的数据为空。

这是代码：

组合框方法：

private void populateFromMedication()
{
    MedicationList medicationItem = new MedicationList();
    // if item is selected
    if( !( ( Locations )cmbLocationDescriptionList.SelectedItem == null ) )
    {
        // set location to be the seletect location from the combo
        location = ( Locations )cmbLocationDescriptionList.SelectedItem;
        List<MedicationList> fromMedicatitionList = new List<MedicationList>();
        // retrieve a list of medication from the database
        fromMedicatitionList = LocationData.RetrieveMedicationByLocation( location.LocationID, GlobalVariables.SelectedResident.ResidentID );
        //bind the list for to the medication list
        lstMedicationForCurrentLocation.ItemsSource = fromMedicatitionList;
        lstMedicationForCurrentLocation.DisplayMemberPath = "Description";        
    } 
}

表单初始化：

public FormInitialize()
{
    InitializeComponent();
    LoadData();
    LoadResidentData();
    populateFromMedication();
}

药物清单类别：

           public class MedicationList
{
    public int MedicationID { get; set; }

    public string Description
    {
        get
        {
            return Description;
        }
        set
        {
            Description = value;
            OnPropertyChanged( "Description" );
        }
    }
}

string _Description;
public string Description
{
    get
    {
        return _Description;
    }
    set
    {
        _Description = value;
        OnPropertyChanged("Description");
    }
}