'Declaration Public Property IsEditable As Nullable(Of Boolean)
public Nullable<bool> IsEditable {get; set;}
If IsEditable is set to False, the textbox portion of the editor is not editable. It will not let you enter any text. In this mode the only way to modify the value of editor is to select an item from the drop down. This differs from property in that the IsReadOnly doesn't let you modify the value of the editor at all.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2