ATTR_POPUP_DEFAULT_ITEM
| Data Type: | integer | 
| Access: | read/write | 
| Functions: | SetTrayIconMenuAttr GetTrayIconMenuAttr | 
| Description: | Specifies the 1–based index of the default item in the popup menu as returned by InsertTrayIconMenuItem,   or 0 if you do not want a default menu item. Linux: This attribute is not supported. | 
| LabWindows/CVI Compatibility: | LabWindows/CVI 5.5 and later | 
