Data Binding a list to a user control dependency property

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XAML

WPF

data-binding

I am having no luck finding out what I am doing wrong. I made a user control that has a List<string> for a dependency property. When I data bind to that property, nothing is in the list. I used the same data to bind to a ComboBox and it shows the list just fine.

Here is my dependency property:

public List<string> ValueList
{
  get { return (List<string>)GetValue(ValueListProperty); }
  set { SetValue(ValueListProperty, value); }
}

// Using a DependencyProperty as the backing store for ValueList.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty ValueListProperty =
    DependencyProperty.Register("ValueList", typeof(List<string>), 
                                             typeof(ValueBox),
                                             new FrameworkPropertyMetadata
                                             {
                                               DefaultValue = new List<string>(),
                                               DefaultUpdateSourceTrigger = System.Windows.Data.UpdateSourceTrigger.PropertyChanged,
                                             });

Here is my data object that I am trying to bind:

private ObservableCollection<string> _valueList1 = new ObservableCollection<string>();
/// <summary>
/// List of items for Valueboxes that display a list of items.
/// </summary>
public ObservableCollection<string> ValueList1
{
  get
  {
    return _valueList1;
  }
  set
  {
    if (value != _valueList1)
    {
      _valueList1 = value;
      NotifyPropertyChanged("ValueList1");
    }
  }
}

It gets populated in the code behind with several values, which I noticed does not fire the Set, but it works with the combobox so I assume that is not the problem.

Here is the XAML for the control. The ComboBox works, my control does not see anything in the ValueList property:

<ComboBox Width="120" 
                       ItemsSource="{Binding ValueList1}"
                       Text="{Binding Label1}"
                       IsEditable="True"/>
<uc:UserControl Value="Test" 
                             ValueType="OPTION"
                             ValueList="{Binding ValueList1}"/>

Now if I put the data in the control in the XAML, it works fine:

<uc:UserControl Value="Yes" 
                             ValueType="OPTION">
    <uc:UserControl.ValueList>
        <System:String>No</System:String>
        <System:String>Yes</System:String>
    </uc:UserControl.ValueList>
</uc:UserControl>