Code:
dialog x {
  size -1 -1 400 100
  menu "Menu"         , [color:blue]1[/color]
  item "Menu item"    , 2, [color:blue]1[/color]
  menu "Submenu"      , [color:red]3[/color], [color:blue]1[/color]
  item "Submenu item" , 4, [color:red]3[/color]
  item "Menu item 2"  , 5, [color:blue]1[/color]
}