AddLayout adds a layout to the screen so that it is visible (if not hidden with SetVisibility)
See Also: RemoveLayout.
Example - Vertical
function OnStart()
{
lay = app.CreateLayout( "Linear", "FillXY,VCenter" );
txt = app.CreateText( "Hello" );
txt.SetTextSize( 50 );
lay.AddChild( txt );
app.AddLayout( lay );
}