B4J Question How to stop B4ABuilder - Command line compilation in Jshell

#Region Project Attributes
    #MainFormWidth: 600
    #MainFormHeight: 600
#End Region

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private xui As XUI
    Private Shell As Shell
    Private btnStart As B4XView
    Private btnStop As B4XView
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("Layout1")
    MainForm.Show
    
    Shell.Initialize("Shell", "cmd", Array("/c","""E:\Program Files (x86)\Anywhere Software\Basic4android\B4ABuilder.exe""","-Task=Build","-NoSign=False","-Obfuscate=False","-BaseFolder=C:\xampp\htdocs\shopper\shop"))
End Sub

Sub btnStart_Click
    Log("Started")
    Shell.Run(-1)
End Sub
Sub btnStop_Click
    Log("Stoped")
    Shell.KillProcess
End Sub

Sub Shell_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)
    Log($"Success: ${Success},
    Out: ${StdOut}
    Error: ${StdErr}"$)
    Log(Success)
    Log("#################################################")
    Log(StdOut)
    Log("#################################################")
    Log(StdErr)
End Sub