returns the tab's enabled/disabled state
| boolean | true/false if a tab is enabled/disabled | 
var myTabbar = new dhtmlXTabBar("parentId");
 
myTabbar.addTab("a1", "Rage", null, null, true);
myTabbar.addTab("a2", "Motorhead");
myTabbar.addTab("a3", "Poisonblack");
 
var isEn = myTabbar.tabs("a1").isEnabled();
added in 4.0
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