Following is the code for your question which will add the Tab at the Left and will select the newly added one.
<div id="example">
<div class="box">
<div class="box-col">
<h4> </h4>
<ul class="options">
<li>
<input type="text" value="Item" id="beforeText" class="k-textbox"/> <button class="beforeItem k-button">Insert Before</button>
</li>
</ul>
</div>
</div>
<div class="demo-section k-header">
<div id="tabstrip">
<ul>
<li class="k-state-active">
Baseball
</li>
</ul>
<div>
<p>Hello</p>
</div>
</div>
</div>
<script>
$(document).ready(function() {
var getItem = function (target) {
var itemIndex = target[0].value;
return tabStrip.tabGroup.children("li").eq(itemIndex);
},
before = function (e) {
tabStrip.select(0);
if (e.type != "keypress" || kendo.keys.ENTER == e.keyCode)
tabStrip.insertBefore({
text: $("#beforeText").val(),
content: "<br>"
}, tabStrip.select());
tabStrip.select(0);
};
$(".beforeItem").click(before);
$("#beforeText").keypress(before);
});
var tabStrip = $("#tabstrip").kendoTabStrip().data("kendoTabStrip");
</script>
<style scoped>
.box-col {
width: 230px;
}
.box .k-textbox {
width: 80px;
}
.demo-section {
width: 600px;
min-height: 250px;
}
</style>
</div>