# Custom app iframe limitation **URL:** https://community.fibery.io/t/custom-app-iframe-limitation/11166 **Category:** API & Programming **Created:** [August 13, 2026, 2:48am UTC](https://community.fibery.io/t/custom-app-iframe-limitation/11166 "2026-08-13T02:48:36Z") **Posts on this page:** 4 **Page:** 1
### Author: ![AdVhPkgKad](https://avatars.discourse-cdn.com/v4/letter/a/7993a0/32.png) [@AdVhPkgKad](https://community.fibery.io/u/AdVhPkgKad) #### Post date: [August 13, 2026, 2:48am UTC](https://community.fibery.io/t/custom-app-iframe-limitation/11166/1 "2026-08-13T02:48:36Z")
`'https://[URL].fibery.io/Asset_Management/Asset-Assignment' from frame with URL 'https://[URL].fibery.io/apps/new-app/'. The frame attempting navigation of the top-level window is sandboxed, but the flag of 'allow-top-navigation' or 'allow-top-navigation-by-user-activation' is not set."` I noticed this error when I tried to get the app to navigate using # to reference an entity (for a side panel to open). I don’t know if this is intended for security. Having to open in a new tab (target=“\_blank”) breaks the flow for users—they’d sooner the two-panel view. Is there a workaround? ---
### Author: ![Sergey\_Truhtanov](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/sergey_truhtanov/32/13986_2.png) [@Sergey\_Truhtanov](https://community.fibery.io/u/Sergey_Truhtanov) #### Post date: [August 13, 2026, 10:16am UTC](https://community.fibery.io/t/custom-app-iframe-limitation/11166/2 "2026-08-13T10:16:50Z")
So far custom-app cannot open Fibery Entity in a panel. We are working on this and soon will enable this functionality, we know it’s a basic one. ---
### Author: ![mdubakov](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/mdubakov/32/10_2.png) [@mdubakov](https://community.fibery.io/u/mdubakov) #### Post date: [September 3, 2026, 12:50pm UTC](https://community.fibery.io/t/custom-app-iframe-limitation/11166/3 "2026-09-03T12:50:11Z")
> [@AdVhPkgKad](#): > > I noticed this error when I tried to get the app to navigate using # to reference an entity (for a side panel to open) Should work on new custom app platform version [September 3, 2026 / Custom Apps updates, Set a load limit for Lists and Tables on Entity View, Multi-window support in the desktop app](https://community.fibery.io/t/september-3-2026-custom-apps-updates-set-a-load-limit-for-lists-and-tables-on-entity-view-multi-window-support-in-the-desktop-app/11243/2) ---
### Author: ![Chr1sG](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/chr1sg/32/3941_2.png) [@Chr1sG](https://community.fibery.io/u/Chr1sG) #### Post date: [September 3, 2026, 2:40pm UTC](https://community.fibery.io/t/custom-app-iframe-limitation/11166/4 "2026-09-03T14:40:15Z")