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procedure TForm1.ComboBox1DrawItem(Control: TWinControl; Index: Integer;
Rect: TRect; State: TOwnerDrawState);
var
ItemString: string;
begin
TComboBox(Control).Canvas.FillRect(Rect);
ItemString := TComboBox(Control).Items.Strings[Index];
DrawText(TComboBox(Control).Canvas.Handle, PChar(ItemString), - 1, Rect, DT_CENTER);
end;