This works with simple 1 activity project:
How to clear 4 Labels on , TabStrip1.LoadLayout("Page1", "PAGE 1")
B4X:
Sub Button1_Click
For Each vw As View In Activity
' check its type
If vw Is Label Then
' labl = vw
Dim labl As Label
labl = vw
labl.Visible = False
' need object with correct type so
' can gain access to properties
' make copy of original view
' labl.Visible = False
' labl = vw
' Log (btn.Text)
End If
Next
End Sub