Podes hacerlo en un combobox normal, poniendo su propiedad Style a csOwnerDrawFixed o csOwnerDrawVariable (dependiendo de si la altura de los items es variable o no), y luego escribiendo el evento OnDrawItem.
La misma ayuda de delphi dice:
Cita:
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Empezado por F1
Write an OnDrawItem event handler to draw the items in the drop-down list of an owner-draw combo box. An OnDrawItem event handler can add graphic elements to the list items, or replace the list item text by graphics.
Draw the items on the Canvas using the coordinates provided by the Rect parameter. OnDrawItem occurs only if Style is set to csOwnerDrawFixed or csOwnerDrawVariable.
If an OnDrawItem event handler is not provided, the combo box fills the Rect parameter with the current brush and writes the text value of the item specified by the Index parameter.
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Hasta luego.
