[TIMOB-3798] proxies fail to retain (in terms of scoping) properties set at creation

pintley.ui.screens.createLeaderboardTab = function(_data,_returnView) {
	var leaderboardWindow = Titanium.UI.createWindow($$.Window);
	
	pointsData = _data;
	tableData = [];
	tableRows = [];
	
	// display objects
	tableView = Titanium.UI.createTableView({
		data:tableRows,
		backgroundColor:'white'
	});
	
	leaderboardWindow.add(tableView);
	
	// when this window is shown, get some data
	leaderboardWindow.addEventListener('open',function(){
		alert('you opened this tab');
	});

	var tab = Titanium.UI.createTab({
		icon:'images/tab_friends.png',
		title:'Leaderboard',
		window:leaderboardWindow
	});
	
	return tab;
};