treecombobox AcceptOnDblClick property
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Applies to
acTreeComboBox component.  

property AcceptOnDblClick: Boolean;  

The AcceptOnDblClick property controls wether the tree node can be selected by double click or by single click.  
Set AcceptOnDblClick to True, if you think that user should double click the node to select it, or leave it False if you would like to make it selectable by single mouse click.  

See also
TreeOptions property.