Android Question Button does not function inside the panel

Sub Globals
    Dim pnlMenu As Panel
    Dim btnPlay As Button
End Sub

Sub Activity_Create(FirstTime As Boolean)
    pnlMenu.Initialize("")
    Activity.AddView(pnlMenu,0dip,0dip,100%x,100%y)
'    pnlMenu.SetBackgroundImage(LoadBitmap(File.DirAssets,"menu.png"))
    btnPlay.Initialize("button_play")
    btnPlay.Text="Herry"
    pnlMenu.AddView(btnPlay,0,0,50%x,70%y)
End Sub

Sub button_play_click
    ToastMessageShow("you rocked the world!!!, yeah",True)
End Sub

Sub CREATE_SLIDE_MENU
    sldMenu.Initialize("Drawer", pnlMenu, (pnlMenu.Width-100dip))
    sldMenu.SetEdgeSize(sldMenu.GRAVITY_START,sldMenu.GetEdgeSize(sldMenu.GRAVITY_START) * 3)
    'btn sound
    btnSound.Initialize("button_sound")
    btnSound.SetBackgroundImage(LoadBitmap(File.DirAssets,"btnsound.png"))
    'btn Music
    btnMusic.Initialize("button_music")
    btnMusic.SetBackgroundImage(LoadBitmap(File.DirAssets,"btnmusic.png"))
    'view
    sldMenu.NavigationPanel.AddView(btnSound,50%x - 80%x / 2,70%y - 50%y / 2,(pnlMenu.Width-130%x),(pnlMenu.Height-250%y))
    sldMenu.NavigationPanel.AddView(btnMusic,110%x - 170%x / 2,70%y - 50%y / 2,(pnlMenu.Width-130%x),(pnlMenu.Height-250%y))
    sldMenu.NavigationPanel.SetBackgroundImage(LoadBitmap(File.DirAssets,"slidemenu.png"))
   
    'sldMenu.NavigationPanel.Color = Colors.RGB(209,151,35)
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("Layout1")
    'display panel
    pnlMenu.Initialize("")
    Activity.AddView(pnlMenu,0dip,0dip,100%x,100%y)
    pnlMenu.SetBackgroundImage(LoadBitmap(File.DirAssets,"menu.png"))
   
    CREATE_SLIDE_MENU

    'play button
    btnPlay.Initialize("btnplay")
    btnPlay.Text = "Herry"
    pnlMenu.AddView(btnPlay,50%x - 80%x / 2, 50%y - 40%y / 2, 80%x, 40%y)
   
'    CREATE_SLIDE_MENU
End Sub