var column =  [
        { id: "custnm", name: "Customer name", type: "text"  , width: "150", align: 'left' },
        { id: "amt"   , name: "accounts receivable"  , type: "number", scale: "n", width: "150" },
        { id: "amt2"  , name: "accounts payable", type: "number", scale: "n", width: "150" },
        { id: "amt3"  , name: "sale price", type: "number", scale: "n", width: "150" },
    ];
    var sumColumn =  [
        { id: "custnm", name: "total"    , type: "text"  , width: "150", align: 'center' },
        { id: "amt"   , name: "accounts receivable"  , type: "number", scale: "n"  , sumtype : 'sum', width: "150" },
        { id: "amt2"  , name: "accounts payable", type: "number", scale: "n"  , sumtype : 'avg', width: "150" },  
        { id: "amt3"  , name: "sale price", type: "number", scale: "n"  , sumtype : 'sum', width: "150" },
    ];

    var option = {};
    wdtGrid.create('grid1', column, option);    
    wdtGrid.setSumColumn('grid1', sumColumn);  
    wdtGrid.setData('grid1', data);