Android Question ToggleButton - How to tell human press from programmatic change?

Sub Globals
   Dim IgnoreToggleEvent As Boolean
   Dim HasUserChangedValue As Boolean
   Dim tb As ToggleButton
End Sub

Sub Activity_Create(FirstTime As Boolean)
   tb.Initialize("tb")
   Activity.AddView(tb, 0, 0, 100dip, 100dip)
   tb.Checked = True
End Sub

Sub tb_CheckedChange(Checked As Boolean)
   If IgnoreToggleEvent Then Return
   HasUserChangedValue = True
   Log("User changed")
End Sub

Sub Activity_Click
   IgnoreToggleEvent = True
   tb.Checked = Not(tb.Checked)
   IgnoreToggleEvent = False
End Sub

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Dim TB1Auto As Boolean
    Dim TB1Manual As Boolean
    Dim TB1ManualState As Boolean
End Sub

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    'These variables can only be accessed from this module.

    Private TB1 As ToggleButton
    Private btn1 As Button
    Private Btn2 As Button
End Sub

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    Activity.LoadLayout("1")

End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Sub TB1_CheckedChange(Checked As Boolean)
    If Not(TB1Auto) Then
        TB1Manual = True
        TB1ManualState = Checked
    Else
        If TB1Manual AND Checked <> TB1ManualState Then
            TB1.Checked = TB1ManualState
        End If
        TB1Auto = False
    End If
End Sub
Sub btn1_Click
    'Simulate an auto Update
    TB1Auto = True
    TB1.Checked = Not(TB1.Checked)
End Sub
Sub Btn2_Click
    'Clear the manual update field
    TB1Manual = False
End Sub