[Shortcut keys]

    var option = { addRow : true, delRow : true }; // add row, remove row : option value
    wdtGrid.create(column, option);
    or
    wdtGrid.setOption(option);

    * add row :  
        ctrl + ↑ : add at top
        ctrl + ↓ : add under selected row
        ctrl + ← : add above selected row
        ctrl + → : add at bottom

    * remove row : 
        ctrl + del : remove selected rows

    var option = { addRow : true, delRow : true };    
    var grid1 = new WdtGrid('grid1');
    grid1.create(column, option);
    grid1.setData(data);
    grid1.selectRange(0, 0, 0, 0);
    
    function btn1() {
        grid1.addRow('first');    
    };
    function btn2() {
        grid1.addRow('up');
    };
    function btn3() {
        grid1.addRow('down');    
    };
    function btn4() {
        grid1.addRow('last');    
    };
    function btn5() {
        grid1.removeRow('grid1');    
    };