If the IsTextEditable property is set to false, end-users are not allowed to change, select and copy the text displayed in the edit box, but can click editor buttons (if any). To allow end-users to copy the text, but prevent the text from being edited set the IsTextEditable and BaseEdit.IsReadOnly properties to true. To completely disable the editor (to prevent editing its value and clicking its buttons), set the IsEnabled property to false.
Drop-down editors display their drop-down windows when an end-user clicks the editor's edit box if the IsTextEditable property is set to true.