What I'm trying is so simple, but doesn't work

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Imports Telerik.WinControls.UI

Public Class frmListTest
  Private dtTest As DataTable   

    Private Sub frmListTest_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
            fillDataTable(dtTest)  ' procedure fills the table from an Oracle database procedure

            myDropDownList.DataSource = dtTest

            myDropDownList.ValueMember = "VALUE_MEMBER"
            myDropDownList.DisplayMember = "DISPLAY_MEMBER"

    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        myDropDownList.SelectedValue = 6  '  DOES NOT WORK
    End Sub

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dtTemp structure
value_member     display_member
24                         Athletic Operations Building
1                           Camp Randall Stadium
34                         Camp Randall Stadium Misc.
22                         Cr Sports Center [shell] - Womens Hockey
37                         Goodman Diamond All Season Practice
6                           Goodman Softball Complex
23                         Kellner Hall 
2                           Kohl Center
35                         La Bahn Arena
4                           McClain Center

The dropdown list loads ok, but I can't select an item through the SelectedValue property.

What am I doing wrong, or not doing? 

Telerik V 2016.3.913.40

Visual Studio Pro V 14.0.25431.01

Later

Art

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I've followed an example I found on your site for creating a custom gridview column. 

https://docs.telerik.com/devtools/winforms/gridview/cells/creating-custom-cells

 I was able to get it to work and populate, but only by manually editing the designer document of the form in which the grid was located.   My column type, however, does appear on my list of column types but after adding it, and when I try closing the grid design window I get an error.  Can you tell me what I'm doing wrong?  Attached a screen shot showing my columntype in the list, the column added (column1), and the error message I received.   Thanks for any help you can give me.

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