title: How do I create DataGridViewComboBoxColumn that has a grid-like drop down?
body: <p>I am in need of a DataGridViewComboBoxColumn that displays a multi-column grid drop down, similar to the one described <a href="http://www.codeproject.com/KB/combobox/multicolumncombo.aspx" rel="nofollow">here</a>.  Basically, I need to override the DropDown event of the underlying ComboBox.  The example at the bottom of <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridviewcomboboxeditingcontrol.aspx" rel="nofollow">this page</a> shows how I can add event handlers.  But, I need to override the showing of the drop down.  I'm guessing I need to create my own ComboBox class but how do I connect that with a DataGridViewComboBoxColumn?  Has anyone done something similar?</p>