Android Question Can I add a buttom to a map?

Sub Globals
   dim pointlist as list
end sub

Sub Activity_Create(FirstTime As Boolean)
    pointlist.initialize
end sub

...
' add the button to a map and the map to a list
   Dim m As Map
   m.Initialize
   m.Put("no",no)
   m.Put("x",x)
   m.Put("y",y)
   m.Put ("btn",b) ' b is a button
   If pointlist.IndexOf (m) = -1 Then
     pointlist.Add (m)

   End If


Sub touchbtn_click
   Dim Send As Button
  Send=Sender
  clickedno=Send.tag
   clickedbtn=Sender
    msgbox (clickedbtn.Left, clickedbtn.Top) ' here I get a null pointer exception
' search for the button in the list
   Dim m As Map
   Dim i As Int
   For i=0 To pointlist.Size-1
     m=pointlist.get (i)
     Dim no As Int
     no=m.Get ("no")
     ' Msgbox (no,clickedno)
     If no=clickedno Then
       clickedbtn=m.Get ("btn")
       msgbox (clickedbtn.Left, clickedbtn.Top) ' here I get a null pointer exception


     End If
   Next

' this is what I want to do
Sub timer2_tick
   clickedbtn.SetColorAnimated (1000,Main.ptealcolor,Colors.red)   ' won't work