height String|Number
(default: 200)
Sets max-height of the embedded treeview in pixels. The default value is 200 pixels. If set to "Auto" the height of the popup will depend on the height of the treeview.
Example - set the height
<input id="dropdowntree"/>
<script>
$("#dropdowntree").kendoDropDownTree({
dataSource: [{ text: "item1", value: 1 }, { text: "item2", value: 2 }],
height: 500
});
</script>