let data = {

seq_levelSetpoint:{Tag:"lightCleaningHMI.levelSetpoint"},

seq_stepNo:{Tag:"lightCleaningHMI.stepNo"},

steps:{Textlist:"StepsLightCleaning"}, // what is the correct syntax here??

ColorProperty:0xff00ff00};

let po = UI.OpenFaceplateInPopup("My Faceplate", "My Faceplate Title", data);

po.Left = 100;

po.Top = 150;

po.Visible = true;

 Thank you.

let data = {value:{Tag:"textListValue"}, textList:"HMI_RT_1::@Default.myTextList"};

let po = UI.OpenFaceplateInPopup("fpTextList", "title", data);

po.Left = 100;

po.Top = 150;

po.Visible = true;

 As you see, the properties don't need the {...} Syntax. I don't know why @Default. is needed, but i used the debugger to check how it is used at normal symbolicIOs and just copied it.

Best regards.

ZickZackTIA