timeline section height

I would like to have the first timeline section as unassigned events.
How can i resize only that row?

By default unassigned events shows in the first section.
To resize only first section you could try to handle onBeforeSectionRender event. For example:

scheduler.attachEvent("onBeforeSectionRender", function (mode, section, timeline) {
        if (section.key == 1) {
            return {height: 200}

        return {};

Well i did that and it worked on a time line with 10 + sections.
Tough on a timeline with 2 or section it has no effect. The section height divides equally to 3 and ignores the script.