I am creating an Aggregation connector, although an add-in. I can create a connector without a strong target endpoint using the code below.
EA.Connector connector = signalEle.Connectors.AddNew("", "Aggregation");
connector.SupplierID = parentElement.ElementID;
connector.Subtype = "Strong";
connector.StyleEx = "LFEP=" + strEleName.AttributeGUID + "L;";
connector.ClientEnd.Role = strEleName.Name;
connector.Update();

How to create a connector with a strong target end?
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