[TIMOB-12438] The value if Titanium.UI.Tab.active is incorrect after switching tabs

Steps to reproduce: 1. Create a tab group with two tabs. 2. Programmatically set the "active" property to true, or call setActive(true), for the non-active tab (the second tab). 3. Check the "active" property of the tab. The first tab still returns true but should return false; the second tab returns false but should return true. Note: - Titanium.UI.Tab.active actually changed the tab (the other tab appeared). - There are no such problem after clicking on the tab manually. - Checking the properties asynchronously (after a timeout, in a callback) does not resolve the problem. Example:

var tabGroup = Titanium.UI.createTabGroup();

var redWindow = Titanium.UI.createWindow({ backgroundColor: "red"});
var firstTabInTG = Ti.UI.createTab({
    title: "Title-1",
    window: redWindow
});
tabGroup.addTab(firstTabInTG);

var greenWindow = Titanium.UI.createWindow({ backgroundColor: "green"});
var secondTabInTG = Ti.UI.createTab({
    title: "Title-2",
    window: greenWindow
});
tabGroup.addTab(secondTabInTG);

tabGroup.open();

secondTabInTG.active = true;
firstTabInTG.active; // true - should be false
secondTabInTG.active; // false - should be true