treecombobox ShowEditor property
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Applies to
tcTreeComboBox component.  

property ShowEditor: Boolean;  

The ShowEditor property controls whether user should be able to enter of modify the text in the combo-box using keyboard.  
Set ShowEditor to True if you would like to let user to modify the text with keyboard, otherwise, if user must select the tree node from drop-down list, set ShowEditor to False.  

See also
SelectedNode and TreeOptions properties.