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

property Flat: Boolean;  

The Flat property determines whether the button has a 3D border that provides a raised or lowered look.  
Set Flat to True to remove the raised border when the button is unselected and the lowered border when the button is clicked or selected. When Flat is True, use separate bitmaps for the different button states to provide visual feedback to the user about the button state.  

This property available in Delphi 3 and later.