function OnStart()
{
//Create a layout with objects vertically centered.
lay = app.CreateLayout( "linear", "VCenter,FillXY" );
 
//Create image 1/5 of screen width and correct aspect ratio.
img = app.CreateImage( "Img/Hello World.png", 0.2, -1 );
lay.AddChild( img );
 
//Create a button 1/3 of screen width and 1/10 screen height.
btn = app.CreateButton( "Press Me", 0.3, 0.1 );
btn.SetMargins( 0, 0.05, 0, 0 );
lay.AddChild( btn );
 
//Set function to call when button pressed.
 
btn.SetOnTouch( btn_OnTouch );
 
//Add layout to app.
app.AddLayout( lay );
}
 
//Called when user touches our button.
function btn_OnTouch()
{
//Show a popup message.
date = new Date();
app.ScreenShot( "sdcard/" + date + ".png");
app.ShowPopup( date);
}