title: Combox column in wpf datagrid performance issue
body: <p>I have a wpf form which contains a datagrid. 1 of the columns in the datagrid is of type combobox. There are 1000's of items in the ItemsSource property of the combo-box. Hence it takes significant amount of time to display the values when the arrow besides the combo-box (rendering issue, I believe) is clicked. How can we make the combo-box display the items faster, virtually with no lag?</p>