B4J Tutorial Maximize, minimize, restore and full screen (programmatically)

Based on this post and in other internet searches:

(Attached sample project)

#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 Button1 As B4XView
    Private Button2 As B4XView
    Private Button3 As B4XView
    Private Button4 As B4XView
    Private Button5 As B4XView
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("Layout1")
    MainForm.Show
End Sub

Private Sub setFullscreen(value As Boolean)
    Dim jmf As JavaObject = MainForm
    Dim stage As JavaObject = jmf.GetField("stage")

    stage.RunMethod("setFullScreen", Array As Object(value))
End Sub

Private Sub maximizeMe
    Dim jmf As JavaObject = MainForm
    Dim stage As JavaObject = jmf.GetField("stage")

    stage.RunMethod("setMaximized", Array As Object(True))
End Sub

Private Sub restoreMe
    Dim jmf As JavaObject = MainForm
    Dim stage As JavaObject = jmf.GetField("stage")

    stage.RunMethod("setMaximized", Array As Object(False))
End Sub

Private Sub minimizeMe
    Dim jmf As JavaObject = MainForm
    Dim stage As JavaObject = jmf.GetField("stage")

    stage.RunMethod("setIconified", Array As Object(True))
End Sub

Private Sub Button1_Click
    setFullscreen(True)
End Sub

Private Sub Button2_Click
    setFullscreen(False)
End Sub

Private Sub Button3_Click
    maximizeMe
End Sub

Private Sub Button4_Click
    restoreMe
End Sub

Private Sub Button5_Click
    minimizeMe
End Sub

 

[byz]

but esc can exit,can always full screen?