The ePortal associated controls include the following controls:
ePortal:ePortalButton
ePortal:ePortalCheckBox
ePortal:ePortalDropDownList
ePortal:ePortalImageButton
ePortal:ePortalLinkButton
ePortal:ePortalRadioButton
These controls are all deprecated and are not generated in new applications. Do not manually add these controls to any new applications that you develop.