Bind WPF DataGrid column to indexed property in

[RK62]

How to bind a DataGrid column to an indexed property in XAML?

My property which I try to bind is:

Private m_Correlations As New Dictionary(Of Integer, Double)
Public Property Correlations(ByVal key As Integer) As Double
        Get
             If m_Correlations.ContainsKey(key) Then
                  Return m_Correlations(key)
              Else
                  Return Nothing
              End If
         End Get
          Set(value As Double)
                m_Correlations(key) = value
          End Set
End Property

I have set the ItemsSource for the DataGrid to be my custom object.

Trying to bind the column to the first indexed item with

FieldName="Correlations[0]"

or

FieldName="Correlations(0)"

...doesn't work. The whole column appears with no data in it.