Combobox bound to an objectdatasource reverts to empty string on lost focus

[coolwater]

I have a combobox that is bound to a objectdatasource. The combobox is used as a lookup.

My problem is everytime the combobox looses its focus it reverts to an empty string. The selection disappears (text.property will result to empty string). This is very weird.

Any ideas?

My Code Below:

 Public Class frmUsers_AddEdit    

     Private newUser As Users 
     Private usertypeList As List(Of UserType)

     Private Sub LoadComboboxes()
         Try
             usertypeList = UserTypeDB.GetUserTypeList
             UserTypeComboBox.DataSource = usertypeList

         Catch ex As Exception
             MessageBox.Show(ex.Message, ex.GetType.ToString)
         End Try

     End Sub

     Private Sub frmUsers_AddEdit_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

         Me.LoadComboboxes()
         UsersBindingSource.Add(newUser)

     End Sub 

 end class

 Databindings of my UserTypeComboBox:

    UserTypeComboBox.DataSource = UserTypeBindingSource
    UserTypeComboBox.DisplayMember = UserType
    UserTypeComboBox.ValueMember = UserTypeID
    UserTypeComboBox.SelectedValue =  UsersBindingSource - UserTypeID