public void AddOutRelation(IDesignRelation or)
{
if (!OutRelationList.Contains(or))
{
OutRelationList.Add(or);
}
}
public void RemoveRelation(IDesignRelation dr)
{
if (OutRelationList.Contains(dr))
{
OutRelationList.Remove(dr);
}
if (InRelationList.Contains(dr))
{
InRelationList.Remove(dr);
}
}