title: Cannot check box in DataGridViewCheckBoxColumn?
body: <p>I'm creating a simple <code>DataGridView</code> with a check box column and a text column (more columns will follow, but this is the minimal working example that I'm trying to get working). When I run this code, the checkbox columns appears, but I can't check the boxes.</p>
  
  <pre><code>DataGridViewCheckBoxColumn checkColumn = new DataGridViewCheckBoxColumn();
  checkColumn.ThreeState = false;
  checkColumn.Width = 20;
  
  MyDataGridView.Columns.Add(checkColumn);
  MyDataGridView.Columns.Add(new DataGridViewTextBoxColumn());
  </code></pre>
  
  <p>Since nothing appears in this case, I thought to add some dummy data. </p>
  
  <pre><code>for (int i = 0; i &lt; 10; i++)
  {
      MyDataGridView.Rows.Add(new Object[] { true, "test"});
  }
  </code></pre>
  
  <p>Normally, the <code>DataGridView</code> is populated with data bound from a list of custom objects, like in <a href="https://stackoverflow.com/questions/11268520/how-do-i-bind-a-datagridviewcomboboxcolumn-to-a-property-method-of-an-object-tha">this question of mine</a>, but I thought it would be better to get this working in a basic way before moving on. </p>
  
  <p>I'm not trying to set the checked state programmatically, but rather let the user select and then use that selection in various other event handlers. </p>