sendkeys to PS via .js script

Hello,

I want to call a recorded action thru a custom panel button (the action to call is a plugin-function, which I cant access thru the panel configurator) .So I assigned shortcut-keys for this action and these should be send to PS thru a .js script.

This is my code for testing:

var WshShell = WScript.CreateObject("WScript.Shell");

WshShell.AppActivate("PS");

WScript.Sleep(300);

WshShell.SendKeys("{F1}");

When I run the script with cscript.exe (WINDOWS 8), then the PS Window gets activated, but apparently no "F1" Key is sent, because no new window opens.

Can you help me, please?