title: Hide DropDownList in ComboBox
body: <p>How to hide DropDownList in ComboBox?<br><br></p>
  
  <p>I want use ComboBox only for displaying text.<br>This control look nice, for me is better than TextBox plus Button.<br> So control must be enabled, but without any items.<br>
  When user click arrow (or alt + down key) DropDownList should'n show, because ill select value from custom DataGridView in order to fill back text in ComboBox.</p>
  
  <p><b>Edit. Alternative solution is set DropDownHeight to 1, with show only 1 pixel line after clicking control.</b></p>
  
  <p><b>Edit. Real solution. Answer below</b></p>