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In UI plugin API, addSubTabActionButton function currently supports only "Event" for its subTabEntityTypeName argument. In practice, this limits addSubTabActionButton API to just adding custom buttons under "Event" sub tab of any standard main tab (assuming the given main tab indeed has "Event" sub tab). This RFE aims to improve addSubTabActionButton function so that it supports all standard entity types [1] for its subTabEntityTypeName argument. Just like the current implementation, if the given main tab doesn't have requested sub tab, addSubTabActionButton function will be no-op. [1] http://www.ovirt.org/Features/UIPlugins#Entity_type_reference
Closing old bugs. If this issue is still relevant/important in current version, please re-open the bug.