can't remove all windows with for loop

app.js

// data starts @ line 10
// functions starts @line 47
// ui starts @ line 210


Ti.UI.setBackgroundColor('#252525');
var device = Ti.Platform.osname;
var ng = {};

// start data
(function() {
	ng.data = {};
	ng.data.device = Ti.Platform.osname;
	ng.data.page_name = 'News';
	ng.data.current_window = null;
	ng.data.previous_window = null;
	ng.data.globalZ = 1;
	ng.data.i = 0;
	ng.data.windowID = 0;
	ng.data.window_stack = [];
	ng.data.win_origin = 350;
	ng.data.win_open = 70;
	ng.data.ipadmenu = [{
  		title : 'News'  
  	}, {
  		title : 'Photos'
  	}, {
  		title : 'Videos'
  	}, {
  		title : 'Facts'
  	}, {
  		title : 'Ranks'
  	}, {
  		title : 'Uniform'
  	}, {
  		title : 'Unit GPS'
  	}, {
  		title : 'Jobs & Pay'
  	}, {
  		title : 'Fitness'
  	}, {
  		title : 'Games'
  	}];
})();
// end data

// start functions
(function() {
	ng.functions = {};
	ng.functions.tableviewTop = 0;
	ng.functions.l2_win_open = 0;
	ng.functions.wrapper_view_l2 = null;
	ng.functions.num_cols = 4;
	ng.functions.col_num = 0;
	ng.functions.row_num = 0;

	// character limit on tablerow label text
	ng.functions.slice = function(t) {
	  t = (t.length < 29) ? t : t.slice(0, 29) + ' ...';
	  return t;
	};
	
	ng.functions.orient = function(o) {
		if(o == 1 || o == 2) {
			ng.data.portrait = 1;
		} else {
			ng.data.portrait = 0;
		}
	};
	// listen for article close
	Ti.App.addEventListener('state', function(d) {
		ng.functions.l2_win_open = d.state;
	});
	ng.functions.open_current = Ti.UI.createAnimation({
		left : ng.data.win_origin,
		duration : 400
	});
	ng.functions.new_window = function(url, title, id) {
  	ng.data.globalZ++;
  	ng.data.current_window = ng.ui.ipad.createl2Window('100%');

  	// create wrapper so we can remove it AND whatever is in it.
  	ng.functions.wrapper = Ti.UI.createView({
  		top : 60,
  		left : 60,
  		bottom : 20,
  		right : 20
  	});
  	ng.data.current_window.add(ng.functions.wrapper);

  	// this mimics an included url
  	var data = [{
    	title : 'All Videos',
    	url : 'favorites.js'
    }, {
    	title : 'Playlists',
    	url : 'files/videos/pad/playlists_list_feed.js'
    }, {
    	title : 'Favorites',
    	url : 'files/videos/pad/favorites_feed.js'
    }, {
    	title : 'Uploads',
    	url : 'files/videos/pad/most_recent_feed.js'
    }];

    // create the rss table
    ng.functions.wrapper.add(ng.ui.ipad.create_GENERIC_TableView(data, 0));
  	// end mimic included url

  	// make id access inside url
  	ng.data.vid_id = id;
  	//Ti.include(url); // commented out for demo

  	win.add(ng.data.current_window);

  	ng.functions.open_current.animate(ng.data.current_window);

  	// push new window onto stack
  	var this_win_id = ng.data.windowID++;
  	ng.data.current_window.winID = this_win_id;
  	ng.data.window_stack.push(ng.data.current_window);
  };
	ng.functions.set_ipad_menu = function(device, menu) {
		menu_array = [];
		ipad = 1;
		var len = menu.length;

		for( m = 0; m < len; m++) {
			var menu_item = Ti.UI.createTableViewRow({
				backgroundImage : 'files/images/pad/main-menu/main-menu-row-bg.jpg',
				height : 50,
				width : 440,
				left : 0,
				top : 0,
				url : menu[m].url,
				id : m,
				ti : menu[m].title,
				leftImage : 'files/images/pad/main-menu/divot-unselected.png',
				selectedBackgroundColor : 'none'
			});

			var img = ng.ui.createIpadAppMenuImageView(menu[m].img);
			var label = ng.ui.createAppMenuLabel(ipad, menu[m].title, menu[m].url);
			menu_item.add(img, label);

			menu_item.addEventListener('click', function(e) {
				var id = e.rowData.id;
				var url = e.rowData.url;
				var title = e.rowData.ti;

				// opening new top-level window so close everything and replace
				if(ng.data.window_stack.length){
					for(w in ng.data.window_stack){
						win.remove(ng.data.window_stack[w]);
					}
					// clean out array
					ng.data.window_stack = [];
				}
				
				//ng.functions.new_window(url, title, id);
				ng.data.windowID = 0;
				ng.data.globalZ = 1;
			});
			menu_array.push(menu_item);
		}
		return menu_array;
	};
})();
// end functions

// start ui
(function() {
	ng.ui = {};
	ng.ui.ipad = {};

	// first level window (ipad)
	ng.ui.ipad.createRootWindow = function(url) {
		return Ti.UI.createWindow({
			navBarHidden : true,
			zIndex : 1
		});
	};
	// second level window (ipad)
	ng.ui.ipad.createl2Window = function(left) {// left = 320 for main wins, 100% for sub wins
		var l2 = 'window_' + Math.random() * 99;
		l2 = Ti.UI.createWindow({
			device : ng.data.device,
			backgroundColor : '#888',
			backgroundLeftCap : 1,
			backgroundTopCap : 1,
			top : 70,
			height : 618,
			left : left,
			width : 500, // 639
			zIndex : ng.data.globalZ,
			borderRadius : 10
		});
		var l2_handle = Ti.UI.createView({
			backgroundColor : 'green',
			left : 20,
			top : 60,
			width : 40,
			height : 538,
			view_origin : ng.data.win_origin,
			view_open : ng.data.win_open
		});
		l2.add(l2_handle);
		return l2;
	};
	ng.ui.ipad.createMainMenu = function(data) {
		var main_menu = Ti.UI.createTableView({
			data : data,
			backgroundColor : '#333',
			left : 10,
			top : 70,
			width : 444,
			height : 554,
			borderRadius : 10,
			separatorColor : 'transparent'
		});
		main_menu.footerView = ng.ui.createAppTableFooter();

		return main_menu;
	};
	// top level tabgroup for ipad
	ng.ui.ipad.createRootTabgroup = function() {
		var index = Titanium.UI.createTabGroup();
		win = ng.ui.ipad.createRootWindow();
		var tab = Titanium.UI.createTab({
			window : win
		});
		win.hideTabBar();
		index.addTab(tab);
		ng.functions.new_window('files/news/index.js', 'News', 0);
    ng.ui.main_menu = ng.ui.ipad.createMainMenu(ng.functions.set_ipad_menu('ipad', ng.data.ipadmenu));
    win.add(ng.ui.main_menu);

		ng.functions.orient(Ti.UI.orientation);

		Ti.Gesture.addEventListener('orientationchange', function(e) {
			ng.functions.orient(e.orientation);
		});

		return index;
	};
	
	// l2 tableview
	ng.ui.createAppTableview_l2 = function(data) {
		return Ti.UI.createTableView({
			data : data,
			left : 50,
			top : 0,
			right : 0,
			bottom : 0
		});
	};
	// tableview header
	ng.ui.createAppTableHeader = function() {
		return Ti.UI.createView();
	};
	// tableview footer
	ng.ui.createAppTableFooter = function() {
		return Ti.UI.createView({
			height : 0
		});
	};
	// main menu image views
	ng.ui.createIpadAppMenuImageView = function(img) {
		return Ti.UI.createImageView({
			image : img,
			left : 40,
			width : 30,
			height : 30,
			top : 0,
			bottom : 0,
			touchEnabled : false
		});
	};
	// main menu image views
	ng.ui.createAppMenuLabel = function(ipad, title, url) {
		return Ti.UI.createLabel({
			text : title,
			font : {
				fontSize : 16
			},
			color : '#fff',
			left : 20,
			right : 0,
			bottom : 0,
			textAlign : 'left',
			url : url,
			height : 54,
			touchEnabled : false
		});
	};
	// table row label
  	ng.ui.ipad.create_GENERIC_TableRow = function(title, rightImage) {
  		var row = Ti.UI.createTableViewRow({
  			backgroundColor : 'transparent',
  			selectedBackgroundColor : 'transparent',
  			top : 0,
  			left : 0,
  			right : 0,
  			height : 60,
  			rightImage : rightImage,
  			backgroundGradient : {
  				type : 'linear',
  				colors : [{
  					color : '#fff',
  					position : 0.0
  				}, {
  					color : '#f1f1f1',
  					position : 0.50
  				}, {
  					color : '#e2e2e2',
  					position : 1.0
  				}]
  			}
  		});
  		var wrap = ng.ui.ipad.create_GENERIC_TableRowWrap();
  		row.add(wrap);
  		wrap.add(ng.ui.ipad.create_GENERIC_TableRowTitle(title));

  		return row;
  	};
  	ng.ui.ipad.create_GENERIC_TableRowWrap = function() {
  		return Ti.UI.createView({
  			top : 0,
  			left : 10,
  			height : 50.5,
  			width : 290,
  			backgroundColor : 'none'
  		});
  	};
  	// table row label
  	ng.ui.ipad.create_GENERIC_TableRowTitle = function(t) {
  		return Ti.UI.createLabel({
  			text : ng.functions.slice(t),
  			height : 'auto',
  			top : 16,
  			left : 10,
  			right : 10,
  			textAlign : 'left',
  			color : '#555',
  			font : {
  				fontSize : 15
  			}
  		});
  	};
	ng.ui.ipad.create_GENERIC_TableViewData = function(d) {
		var data = [];
		for(var i = 0; i < d.length; i++) {
			var title = d[i].title;
			var url = d[i].url;
			var rightImage = (d[i].rightImage != null) ? d[i].rightImage : 'files/images/tablerow-right-arrow.png';

			// Create a table row for this item
			row = ng.ui.ipad.create_GENERIC_TableRow(title, rightImage);
			row.ti = title;
			row.url = url;
			data[i] = row;

			// Create tableView row event listener
			row.addEventListener('singletap', function(e) {
				ng.functions.new_window(e.rowData.url, e.rowData.ti, null);
			});
			// end row listener
		}// end function
		return data;
	};
	ng.ui.ipad.create_GENERIC_TableView = function(data, type) {
		tv = Ti.UI.createTableView({
			backgroundColor : 'orange',
			left : 0,
			top : 0,
			right : 0,
			bottom : 0,
			layout : 'vertical',
			separatorColor : 'transparent',
			view_origin : ng.data.win_origin,
			view_open : 70
		});
		switch(type) {
			case 0:
				tv.setData(ng.ui.ipad.create_GENERIC_TableViewData(data));
				// generic - ranks, facts, weapons, etc
				break;
			case 1:
				tv.setData(ng.ui.ipad.create_NEWS_TableViewData(data));
				// news
				break;
			case 2:
				tv.setData(ng.ui.ipad.create_VIDEO_TableViewData(data));
				// video
				break;
			case 3:
				tv.setData(ng.ui.ipad.create_PLAYLIST_TableViewData(data));
				// video playlist
				break;
		}
		return tv;
	};
})();
// end ui



// app.js
win = ng.ui.ipad.createRootTabgroup();
win.open();