Get Screen in Screen name

Hello all,

I need to get the current ScreenName of  "Screen Window_1". But this screen window in inside a other screen window. I would like this script to be run at the top level (Named swContent_1, its the main screen window) In this main window different menu screen can be called for different settings. Each of these menu screens has a screen window, the current screen name of that window is what i need to write to a tag.

But the problem is i cant seem to target it with a find item.

//

//

With this script I get this error:

Error: /screen_modules/HMI_RT_8::00_ScreenLayout_Single/Triggers.js:18: Uncaught TypeError: Cannot read properties of undefined (reading 'ScreenName')

var scnd_Screen = Screen.FindItem("../Screen window_1").ScreenName;

^

TypeError: Cannot read properties of undefined (reading 'ScreenName')

at Object.swContent_1_Screen_Trigger (/screen_modules/HMI_RT_8::00_ScreenLayout_Single/Triggers.js:18:56)

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The printscreen shows which name im trying to get. Anyone with a clue?

Tia portal v18