Binding in Tag Editor - Expression not possible?

[arun1]

I have tag (type UDT) with folders and standard tags inside those folders. I would like to bind the Alarm Eval Enabled property to another tag but there does not seem to be a way to use regular Expressions to connect to another tag. I would like to connect this property to something like this:
({[.]../../J2_MP206/PLC_Inputs/XS} && {[.]../../J2_MP206/PC_Controls/Formula} = 1)

But if I go into those alarms and pick an alarm, then I can bind the Enabled property to the same expression. My question is why doesn't Ignition allow Expression on the properties outside but allows Expression in the properties inside the alarm?

[nminchin]

You'll need to write these changes with a script instead. I'm not entirely sure why some props can be bound to tags while other's can't; I presume it's to do with performance impacts?

You can add a valueChange script on the reference tag which writes to that tag's AlarmEvalEnabled prop