title: populate combobox from datatable but change datatable selected item
body: <p>question may need rewording, but here is the issue, and code I am using is posted below</p>
  
  <p>some background so as to understand I have a datatable bound to a datagridview with a column name column names in the code I will only show a portion of column names to save space, this section works but its needed to show issues</p>
  
  <pre><code> DataGridView3.DataSource = fieldDT
          DataGridView3.AutoGenerateColumns = True
          fieldDT.Columns.Add("Column Name", System.Type.GetType("System.String"))
          DataGridView3.Columns(0).Width = 123
          fieldDT.Columns.Add("Field", System.Type.GetType("System.String"))
          DataGridView3.Columns(1).Width = 86
          'columns 2 through 12 are here
          fieldDT.Columns.Add("Format", System.Type.GetType("System.String"))
          DataGridView3.Columns(13).Width = 45
          fieldDT.Columns.Add(" ", System.Type.GetType("System.String"))
          DataGridView3.Columns(14).AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill
  </code></pre>
  
  <p>I also have a combobox that I want populated with the column name in the above datatable  code to bind shown next</p>
  
  <pre><code>ComboBox10.DataSource = fieldDT
          ComboBox10.DisplayMember = "Column Name"
          ComboBox10.ValueMember = "Column Name"
  </code></pre>
  
  <p>the combobox populates correctly with all the columnnames in the datatable</p>
  
  <p>now is where the issue that I need a way to fix arises, </p>
  
  <p>if I select a row in the datagridview it is changing the displayed value in the combobox, and if I select a different value in the combobox it changes the selected row in the datagridview my feeling this is by default design but hoping it can be changed</p>
  
  <p>although the combobox needs that column list and needs to be upto date if someone adds another row to the datagridview I don't want them to bind in the way they change each other.</p>
  
  <p>the combo box is used for another purpose that it needs to select one of the available column names</p>