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Only fragments support that function where ZO_MixinHideableSceneFragment was used during their initialization,
like ZO_ActionLayerFragment or ZO_HUDFadeSceneFragment
You need to use on of the fragments or call ZO_MixinHideableSceneFragment (yourFragmentObject) to add the function to your fragment.
See ZOs code at:
esoui/libraries/zo_scene/zo_scenefragmenttemplates.lua
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