call script event

I have a puzzling problem:

I have a script that when I click in a button, it runs another .ps1 script. In Powershell ISE it works perfectly, but when I start from a Batch Script it not work, not start the second script.
The event:

Register-ObjectEvent $call_x1 Click click_event -Action {
    Invoke-Expression "E:\Tests\x1.ps1"