How do i change height of childblocks in jqwidgets treemaps

{
                label: '.',
                value: 0.05,
                parent: 'City',
                color: '#fff',
                data: { description: "", title: "Road Side" }
            },

here can pass height and width of childblocks

$('#treemap').jqxTreeMap({
                width: 900,
                height: 200,
                source: data,
                colorRange: 50,
                layout: 'vertical',
                renderCallbacks: {
                    '*': function (element, value) {
                        if (value.data) {
                            element.jqxTooltip({
                                content: '<div><div style="font-weight: bold; max-width: 200px; font-family: verdana; font-size: 13px;">' + value.data.title + '</div><div style="width: 200px; font-family: verdana; font-size: 12px;">' + value.data.description + '</div></div>',
                                position: 'mouse',
                                autoHideDelay: 6000,
                                theme: theme
                            });
                        } else if (value.data === undefined) {
                            element.css({
                                backgroundColor: '#fff',
                                border: '1px solid #555'
                            });
                        }
                    }
                }
            });
        });

i want to display childblocks fix height and width where data has been passed from json