Unit
tcTreeComboBox  

Hierarchy
TObject  
|  
TPersistent  
|  
TComponent  
|  
TControl  
|  
TWinControl  
|  
TCustomEdit  
|  
TEdit  
|  
TtcCustomEdit  
|  
TtcEdit  
|  
TtcCustomDropDownEdit  
|  
TtcTreeComboBox