Pull request #1524: 无JIRA fix : showIndex修改为-1,免去按tab键的focus

Merge in VISUAL/fineui from ~DAILER/fineui:master to master

* commit 'c7084a494006ca6cff2380a02f8a756e15af81f9':
  无JIRA  fix : showIndex修改为-1,免去按tab键的focus

src/base/combination/combo.js

@@ -10,7 +10,7 @@
             return BI.extend(conf, {
                 baseCls: (conf.baseCls || "") + " bi-combo" + (BI.isIE() ? " hack" : ""),
                 attributes: {
-                    tabIndex: 0
+                    tabIndex: -1
                 },
                 trigger: "click",
                 toggle: true,