SMART datagrid v.1 > Classes > ButtonCellRenderer
The URL of default image of button.
Defaults to null.
    var columns = [{
        name: "column1",
        renderer: {
            type: "button",
            imageUrl : "img/btn_normal.png"
        }
    },
    ...
    ];
    grid.setColumns(columns);
    $("#changeImage").click(function () {
        var col = grid.columnByName('column1');
        col.setRenderer({ 
            imageUrl : "img/btn_normal.png"
        });
    });