Hi all 
I used the scrollView to act as the sidebar (refer to this tutorial : http://coronalabs.com/blog/2014/08/19/tutorial-building-a-sliding-menu/)
In simulator everything is fine : a button to call the scrollView to appear - click button - perform action.
But when I test in device, the button inserted into the scrollView disappear >>> empty sidebar.
Any tips and solution about this?
Thanks in advance 
Coding :
[lua]
function iconListener1( event )
if ( event.phase == “moved” ) then
local dx = math.abs(event.x - event.xStart )
if ( dx > 5 ) then
scrollView:takeFocus( event )
end
local options = {
effect = “fade”,
time = 100
}
elseif ( event.phase == “ended” ) then
– do action
timer.performWithDelay( 10, function() scrollView:removeSelf(); scrollView = nil; end )
print (“Close sidebar”)
end
return true
end
function showSlidingMenu( event )
if ( “ended” == event.phase ) then
scrollView = widget.newScrollView
{
top = 0,
left = 0,
width = 50,
height = H,
hideBackground = true
}
scrollView:setIsLocked( true)
local scrollViewBackground = display.newImageRect( “image/bar.png”,55,H)
scrollViewBackground.x = 25
scrollViewBackground.y = H/2
scrollView:insert( scrollViewBackground )
–generate icons
icon1 = widget.newButton
{ defaultFile = (“image/a.jpg”),
width = 50, height = 50,
onEvent = iconListener1
}
icon1.y = H * 0.2;
scrollView:insert(icon1)
icon2 = widget.newButton
{ defaultFile = (“image/b.jpg”),
width = 50, height = 50,
onEvent = iconListener2
}
icon2.y = icon1.y+icon2.height*1.3
scrollView:insert(icon2)
icon3 = widget.newButton
{ defaultFile = (“image/c.png”),
width = 50, height = 50,
onEvent = iconListener3
}
icon3.y = icon2.y+icon3.height*1.3
scrollView:insert(icon3)
end
return true
end
[/lua]