[TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > CreateAddParameterMenuForAssignmentNode ( [UNiagaraNodeAssignment](API\Plugins\NiagaraEditor\UNiagaraNodeAssignment) * AssignmentNode, const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [SComboButton](API\Runtime\Slate\Widgets\Input\SComboButton) > & AddButton )