WPF: Passing main form property to user control - wpf

Question

I have set up my own user control which contains two ComboBoxes, each ComboBox item source is bound to a DependencyProperty. The issue I am having is passing a property from the form that uses my user control to the user control.
Below is my user control:
public static readonly DependencyProperty ListOneProperty = DependencyProperty.Register
("ListOne", typeof(List<int>), typeof(LinkedComboBox), new PropertyMetadata(new List<int>()));
public List<int> ListOne
{
get { return (List<int>)GetValue(ListOneProperty); }
set { SetValue(ListOneProperty, value); }
}
public static readonly DependencyProperty ListTwoProperty = DependencyProperty.Register
("ListTwo", typeof(List<string>), typeof(LinkedComboBox), new PropertyMetadata(new List<string>()));
public List<string> ListTwo
{
get { return (List<string>)GetValue(ListTwoProperty); }
set { SetValue(ListTwoProperty, value); }
}
public LinkedComboBox()
{
InitializeComponent();
FillListOne();
}
And below is my MainWindow xaml:
<control:LinkedComboBox x:Name="LinkedBox" ListTwo="{Binding MyList}"/>
And MainWindow.xaml.cs:
static List<string> _myList = new List<string>{"abc","efg"};
public List<string> MyList
{
get { return _myList; }
set { _myList = value; }
}
public MainWindow()
{
InitializeComponent();
}
What do I need to get the User Control to accept a binding from the Main Window?

Answer 1

Everything is fine except that you need a PropertyChangedCallback to handle your property.
Here is a simple example
public static readonly DependencyProperty ListTwoProperty = DependencyProperty.Register
("ListTwo", typeof(List<string>), typeof(LinkedComboBox), new PropertyMetadata(new List<string>(), new PropertyChangedCallback(Changed)));
private static void Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
//e.NewValue here is your MyList in MainWindow.
}