Property Drop Down Header Does Not Exist

Unfortunately I still have a few old legacy programs created with C++Builder 6.0 which I can not upgrade. When I open the project in CB6.0 I am getting the Error Message that the Property Drop Down Header in ASG does not exist. The Error box asks me to Ignore or Cancel. I can click Ignore and the program seems to work when I run it. Is there a way to resolve this error so I do not get the Error Message every time the project opens in CB6.0 ? This old setup is using ASG 4.0.14.0
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==============ERROR=======================
AdvStringGrid1->ControlLook->DropDownHeader.Visible 
Property Drop Down Header Does Not Exist
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PS. I have the newer versions of C++BuilderXE3 and TMS Component Pack but I can not upgrade this old projects.
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Thanks
Patrick Mikula

This problem seems to have resolved itself with a complete rebuild. No need to reply.