Solution : https://service.sap.com/sap/support/notes/1562463 (SAP Service marketplace login required)
Key words :
ajax framework page, sap netweaver portal, html object elements, iviews/pages, flash/flex/, overlay components, dropdown menus, popup windows, behave irregularly, partially hidden
Related Notes :
1531306 | Central Note for NetWeaver 7.30 EP / EPC |
1498875 | Ajax Framework Page - Issues detected in SAP NetWeaver 7.30 |