Worked around my difficulties as follows (but would love any other solutions):

    Private Sub CompanySelectionPicker_ItemSelected _
        (ByVal sender As Object, _
        ByVal e As OakLeaf.MM.Main.Windows.Forms.mmPickerItemSelectedEventArgs) _
        Handles CompanySelectionPicker.ItemSelected

        ' Find the position of the primary key selected in the Picker
        Dim companyIdSelected As Integer = _
            CInt(e.dsSelectedItems.Tables.Item(0).Rows(0).Item("CompanyId"))

        ' The user selected an item from the Picker. 
        ' Locate a row in the grid based on the 
        ' Sort column value(s) supplied in a string. 
        Try
            Dim intRow As Integer
            Dim dv As DataView = _
                Me.oCompany.GetCurrentDataSet.Tables("Companies").DefaultView
            Dim dr As DataRow

            ' Set the Sort prop. with Col(s) to search [REQUIRED].
            dv.Sort = "CompanyId"

            ' Set the index of the found row or -1 if not found
            intRow = dv.Find(companyIdSelected)

            ' Handle row not found or found at index greater than available
            If intRow < 0 Or intRow > dv.Count Then
                MsgBox("Row not found based on the criteria provided.")
            Else

                ' Return the matching row
                dr = dv(intRow).Row

                ' Use the form's BindingContext object to set the position
                Me.BindingContext _
                    (CompanyDataset, CompanyDataset.Tables(0).TableName). _
                    Position = intRow

                ' Update form fields with new value selected
                Me.CompanyFormSetFieldValues()

            End If
        Catch exFE As FormatException
            MsgBox(exFE.Message & " ...Find argument setting. " _
            & vbCrLf & companyIdSelected.ToString)
        Catch ex As Exception
            MsgBox(ex.ToString)
        End Try