Spanish porque no desliza un seekbar dentro de un panel incrustrado en un scrollview horizontal

Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI
    
    Private Panel1 As Panel
    Private Panel2 As Panel
    Private SeekBar1 As SeekBar
    Private HorizontalScrollView1 As HorizontalScrollView
End Sub

Public Sub Initialize
'    B4XPages.GetManager.LogEvents = True
End Sub

'This event will be called once, before the page becomes visible.
Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("MainPage")
    
    Panel1.RemoveView
    Panel2.RemoveView
    
    HorizontalScrollView1.Panel.AddView(Panel1,0,0,100%x,100%y)
    HorizontalScrollView1.Panel.AddView(Panel2,100%x,0,100%x,100%y)
    HorizontalScrollView1.Panel.Width=2*100%x
End Sub