Unit
acMRUComboBox  

Hierarchy
TObject  
|  
TPersistent  
|  
TComponent  
|  
TControl  
|  
TWinControl  
|  
TCustomComboBox  
|  
TComboBox  
|  
TacComboBox  
|  
TacLabeledComboBox  
|  
TacMRUComboBox