public Link FindLinkForData( object fromnodedata, object tonodedata, IDiagramModel model )
Parameters
- fromnodedata
 - the data from which the link relationship comes
 - tonodedata
 - the data to which the link relationship goes
 - model
 - the model that the node data are in, not an Northwoods.GoXam.Model.ILinksModel
 
Return Value
a Link, or null if such a link has not been created for that pair of node data