treecombobox OnLabelDblClick event
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Applies to
tcTreeComboBox component.  

property OnLabelDblClick: TNotifyEvent;  

The OnLabelDblClick event occurs when user double clicks the label attached to the control with a mouse.  
tip To make the label appear near the edit control — set AttachedLabel.Visible to True, or to False if you'd like to hide the attached label.  

See also
AttachedLabel structure.