How to add the Link user data?

[Helper]

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On 21/04/2010 at 06:13, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   11.5 
Platform:   Windows  ;   
Language(s) :   C.O.F.F.E.E  ;

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Hi to all,
Please someone can tell me how to add in coffee the user data element called: Link , to a dialog?

For button:
AddButton(MY_BUTTON, BFV_FIT, 100, 15, "Click Me");

For the user data element "Link":
???

Thx