OS Library: killProcess/killBackgroundProcesses not working

Sub Activity_Create(FirstTime As Boolean)
   Dim OS As OperatingSystem
   OS.Initialize("OS")
   Dim lstname,lstpid, lstnamepid, lstret As List
   lstname.Initialize
   lstpid.Initialize
   lstnamepid.Initialize
   lstret=OS.RunningAppProcessInfo(lstname,lstpid,lstnamepid)
   Dim i  As Int
   For i = 0 To lstname.Size - 1
'      Msgbox (lstname.Get(i),lstpid.Get(i))
      If lstname.Get(i) = "com.rovio.angrybirdsrio" Then
'         OS.killBackgroundProcesses(lstname.Get(i))
         OS.killProcess(lstpid.Get(i))
'         Msgbox ("Kill process: " & lstname.Get(i),lstpid.Get(i))
      End If
   Next
   OS.killProcess(OS.myPid)
End Sub

'This code will be applied to the manifest file during compilation.
'You do not need to modify it in most cases.
'See this link for for more information: http://www.b4x.com/forum/showthread.php?p=78136
AddManifestText(
<uses-sdk android:minSdkVersion="4" android:targetSdkVersion="14"/>
<supports-screens android:largeScreens="true" 
    android:normalScreens="true" 
    android:smallScreens="true" 
    android:anyDensity="true"/>
<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>
)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
'End of default text.