Setting Configuration Specific Properties while a Custom Property Tab is loaded

My macro sets a configuration specific property value.

The macro works fine if I unload my Custom Property Tab

Macro does not work if the Custom Property Tab is loaded.  No error, just that the values won't update.  Seems like the tab causes the values to become read only.

If the property I am changing is not included in the tab, the macro updates the property correctly.

Exerpt from code:

result = swDoc.Extension.CustomPropertyManager(sConfigName).Set("PartType", "Buy")

SW 2010SP5

I want the macro to work when the tab is loaded.  Any ideas?  Thanks!

SolidworksApi macros