title: Checkbox in DataGridView does not change its value after checking it
body: <p>I have checkboxes in one of my columns in DataGridView.</p>
  
  <p>And now I have a problem: When I click <strong>once</strong> on Checkbox it changes but only visualy, in code its value is still set to false. But if I click on Checkbox and then anywhere else on my datagridview (or change its value manually in code on true) it changes its value on true.</p>
  
  <p>How can I force my checkbox to change value after one click? (it's annoying that checking checkbox actually does not check it).</p>
  
  <p>Thanks for any help.</p>