treecombobox OnButtonLeftMouseDown event
Previous  Top  Next
Applies to
tcTreeComboBox component.  

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.