https://userapps.support.sap.com/sap/support/knowledge/en/1702339
1702339 - Expand/Collapse tray fails to work for Web Dynpro iviews | SAP Knowledge Base Article
After launching SAP Netweaver Enterprise portal 7.0x and on accessing any Web Dynpro page , when you collapse the tray using "Expand/Collapse" tray, then...