rootPane.panes.selected Number

Specifies the index of the initially selected tab. Available only for panes of type tab.

Example

<div style="height:500px; width:1000px">
    <div id="dockmanager"></div>
</div>
<script>
$("#dockmanager").kendoDockManager({
            rootPane: {
                type: "tab",
                selected: 2,
                panes: [{
                        type: "content",
                        title: "Pane 1",
                        content: "Pane 1"
                    },{
                        type: "content",
                        title: "Pane 2",
                        content: "Pane 2"
                    },{
                        type: "content",
                        title: "Pane 3",
                        content: "Pane 3"
                    }]
            }
        });
</script>