-Optional paramater. A combination of one or more [RuntimeClassType](../windows/runtimeclasstype-enumeration.md) enumeration values. The `__WRL_CONFIGURATION_LEGACY__` macro can be defined to change the default value of classFlags for all runtime classes in the project. If defined, RuntimeClass instances are non-agile by default. When not defined, RuntimeClass instances are agile by default. To avoid ambiguity always specify the `Microsoft::WRL::FtmBase` in `TInterfaces` or `RuntimeClassType::InhibitFtmBase`. Note, if InhibitFtmBase and FtmBase are both used the object will be agile.
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