toolbar.overflow.scrollButtonsString(default: "auto")
Defines the visibility of scroll buttons when mode is "scroll". The available options are:
"auto"— Displays scroll buttons only when needed."hidden"— Hides the scroll buttons at all times."visible"— Always shows the scroll buttons.
Example
<div id="propertyGrid"></div>
<script>
$("#propertyGrid").kendoPropertyGrid({
    toolbar: {
        items: [
            { name: "search" },
            { name: "sort" },
            { name: "group" }
        ],
        overflow: {
            mode: "scroll",
            scrollButtons: "visible"
        }
    },
    model: {
        foo: "bar",
        baz: 5
    }
});
</script>
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