Accesses data about valid connections for line symbols. Returns 0 when data has been obtained.
iIndex is 0 for the first item.
When enuVALIDCONNECTIONWHEN_DEF is set in lWhen, wType1 and wType2 are definition types.
wType3 is the type of the explicit definition.
ValidConnections(ByVal iIndex As Integer, ByRef lType1 As Long, ByRef lType2 As Long, ByRef lType3 As Long, ByRef lWhen As enuSAValidConnectionWhen) As Integer