treecombobox OnButtonLeftMouseDown event
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Applies to
tcTreeComboBox component.  

Declaration
property OnButtonLeftMouseDown: TNotifyEvent;  

Description
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.