Any workaround for this bug?

This is a bug in the FLEX SDK 4.11, any workaround for this issue? I am
trying to create a simpler app to reproduce this meanwhile.

ArgumentError: Error #2025: The supplied DisplayObject must be a child of
the caller.
at flash.display::DisplayObjectContainer/getChildIndex()
at
mx.core::Container/getChildIndex()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/mx/src/mx/core/Container.as:2843]
at
mx.controls::RadioButtonGroup/readOrderCompare()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/mx/src/mx/controls/RadioButtonGroup.as:642]
at
mx.controls::RadioButtonGroup/readOrderCompare()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/mx/src/mx/controls/RadioButtonGroup.as:653]
at Array$/_sort()
at Array/http://adobe.com/AS3/2006/builtin::sort()
at
mx.controls::RadioButtonGroup/http://www.adobe.com/2006/flex/mx/internal::addInstance()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/mx/src/mx/controls/RadioButtonGroup.as:483]
at
mx.controls::RadioButton/addToGroup()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/mx/src/mx/controls/RadioButton.as:582]
at
mx.controls::RadioButton/commitProperties()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/mx/src/mx/controls/RadioButton.as:522]
at
mx.core::UIComponent/validateProperties()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/framework/src/mx/core/UIComponent.as:8482]
at
mx.managers::LayoutManager/validateProperties()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:605]
at
mx.managers::LayoutManager/doPhasedInstantiation()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:821]
at
mx.managers::LayoutManager/doPhasedInstantiationCallback()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1188]