How do I populate comboboxes from entity framework using mvvm

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VB

WPF

MVVM

Hi,

I would like to create cascading comboboxes based on ADO.NET Entity Data Model table.

Partial Public Class tbl_Activities
    Public Property AID As Integer
    Public Property MRU As String
    Public Property Market As String
    Public Property Tower As String
    Public Property FirstActivity As String
    Public Property SecondActivity As String
    Public Property ThirdActivity As String
    Public Property BlockAct As Nullable(Of Boolean)
    Public Property Approved As Nullable(Of Boolean)

End Class

In the first combobox should have FirstActivity, and second combobox should have SecondActivity based on selection of first.

When I was trying to do this, in the first combobox I had doubles and the second combobox was filled only with one value.

Thank you for any suggestions