treecombobox OnButtonLeftMouseDown event
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Applies to
acEdit, acNumberEdit and acTreeComboBox components.  

property OnButtonLeftMouseDown: TNotifyEvent;  

The OnButtonLeftMouseDown event occurs when user presses the left mouse button over the button at the right side of edit control.  
tip To make the button appear on edit control — set Button.Visible to True.  

See also
Button structure.