title: Have cursor on editable Combobox inside DataGridTemplateColumn on pressing F2
body: <p>I have a <code>DataGrid</code> and an editable <code>DataGridComboBoxColumn</code> column inside it.</p>
  
  <p>I wish to horizontally center the content of this combobox column. I tried many things and found many solutions, none of which worked for me. Then I came up with <a href="https://stackoverflow.com/a/26548646/4062881">this</a> solution. (Using a <code>ComboBox</code> inside <code>DataGridTemplateColumn</code>)</p>
  
  <p>The problem is that in my case the <code>ComboBox</code> is editable. So when user presses <code>F2</code> key to edit the content of the <code>ComboBox</code> cell, the focus won't appear inside the editable <code>ComboBox</code>. A mouse click on that cell however works. I am assuming it's obviously because the combobox is inside the template column type. But I want that the cursor appears inside the combobox and it becomes editable when user presses F2 when focused on that cell.</p>
  
  <p>How can I do that?</p>