webix.toPDF([
    {
        id:"chart1",
        options:{
            display:"image",
            textBefore:{
                text:"Population growth in Canada",
                options:{color:0x666666, textAlign:"center", fontSize:15}
            },
            textAfter:"There are three graphs in the chart. The green graph shows the total growth of the population"
        }
    },
    {
        id:"chart2",
        options:{
            display:"table"
        }
    },
    "chart3",
    "chart4"
], {
    docHeader:"Canada population", display:"all"
})