title: Datagridview Combobox Column not displaying select combobox value
body: <p>I am using a normal Datagridview but I have a problem with it.<br>
  This way I am filling data in my grid and adding combobox column to it</p>
  
  <pre><code>db.DataEntities ss = new db.DataEntities();
  DataGridview1.DataSource = ss.table1.ToList();
  
  if (!DataGridview1.Columns.Contains("dgcolUser"))
  {
      DataGridViewComboBoxColumn dgcombocolUser = new DataGridViewComboBoxColumn();
      dgcombocolUser.Name = "dgcolUser";
  
      var listOfAllUsers = ss.secAccountInformations.ToList();
      dgcombocolUser.DataSource = listOfAllUsers;
      dgcombocolUser.DisplayMember = "AccountName";
      dgcombocolUser.ValueMember = "UserId";
      DataGridview1.Columns.Add(dgcombocolUser);
  }
  
  foreach ( DataGridViewRow dgr in DataGridview1.Rows)
  {
      dgr.Cells["dgcolUser"].Value = dgr.Cells["PermittedUserId"].Value;
  }
  </code></pre>
  
  <p>I am opening this Form in a MDI parent<br></p>
  
  <pre><code>Form1 frm = new Form1() { MdiParent = MdiForm1};
  frm.Show();
  </code></pre>
  
  <p>when I open my form it not displaying any selected value in Comboboxcolumn
  But when I open my Form frm1 not it MdiParent it display selected value in Comboboxcolumn</p>
  
  <pre><code>Form1 frm = new Form1();
  frm.Show();
  </code></pre>
  
  <p>so is this really happen because it shows data when i am showing my form without MdiParnet or is there any other reason due to which it is not happening<br>
  Please give me better suggesstion.. because showing form without MdiParent is not valid solution.</p>