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Yes, you need to create a custom PopUpRendererSkin. Try making this change to line 163 of PopUpRendererSkin.mxml:
if (fieldInfo.visible && formattedAttributes[fieldInfo.fieldName])
PopUpRendererSkin.mxml is in the skins folder inside the API's zip file.
Yes, you need to create a custom PopUpRendererSkin. Try making this change to line 163 of PopUpRendererSkin.mxml:
if (fieldInfo.visible && formattedAttributes[fieldInfo.fieldName])