treecombobox Visible property
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Applies to
tcTreeComboBox component as subproperty of Button structure.  

property Visible: Boolean;  

The Visible property determines whether the button appears at the right side of tcTreeComboBox control.  
Use the Visible property to control the visibility of the button at runtime. If Visible is True, the button appears. If Visible is False, the button is not visible.