The ShowAsButtonEnum type specifies the way a
  button is shown. The 
ShowAsButton property
  specifies whether the current item is shown a button or a select button. The
  ShowAsButtonEnum type supports the following values:
 |  | Name | Value | Description |  | 
 |  | 
exShowAsButtonNone | 0
 | 
 No button is associated with the current item.
 |  | 
 |  | 
exShowAsButton | 1
 | 
 A button is associated with the current item. This flag can be combined with
exShowAsButtonAutoSize flag.
    
 |  | 
 |  | 
exShowAsButtonAutoSize | 2
 | 
 The size of the button's caption fits the item's caption. This flag can be
 combined with any other flags.
 |  | 
 |  | 
exShowAsSelectButton | 17
 | 
 A select button is associated with the current item ( show the drop-down button to the right ).
 The
exShowAsSelectButton flag has effect only if the current item is a popup item,
 so it contains sub-items. The SubMenu property
 gives access to the item's sub menu, while it is a popup item. The Add(Caption,SubMenu)
 adds a popup item. The item's SubMenu is shown
 bellow the button, when user clicks the associated arrow. The popup being shown
 is a local popup, so clicking any item inside a local popup makes the popup itself to close including all its descendent sub-menus, without closing any ascendant sub-menus. 
    
 |  | 
 |  | 
exShowAsSelectButtonBottom | 273
 | 
 A select button is associated with the current item ( show the drop-down button to the bottom ).
 The
exShowAsSelectButtonBottom flag has effect only if the current item is a popup
 item, so it contains sub-items. The SubMenu
 property gives access to the item's sub menu, while it is a popup item. The Add(Caption,
SubMenu) adds a popup item ( an item that contains sub-items ). The item's SubMenu
 is shown bellow the button, when user clicks the associated arrow. The popup
 being shown is a local popup, so clicking any item inside a local popup makes the popup itself to close including all its descendent sub-menus, without closing any ascendant sub-menus. 
    
 |  |