columns: [
                    {
                        text: 'Ship City', datafield: 'ShipCity', width: 150, columntype: 'combobox',
                        createeditor: function (row, column, editor) {
                            // assign a new data source to the combobox.
                            var list = ['Stuttgart', 'Rio de Janeiro', 'Strasbourg'];
                            editor.jqxComboBox({ source: list, promptText: "Please Choose:" });
                        },
                        // update the editor's value before saving it.
                        cellvaluechanging: function (row, column, columntype, oldvalue, newvalue) {
                            // return the old value, if the new value is empty.
                            if (newvalue == "") return oldvalue;
                        }
                    },
                    {
                        text: 'Ship Country', datafield: 'ShipCountry', width: 150, columntype: 'dropdownlist',
                        createeditor: function (row, column, editor) {
                            // assign a new data source to the dropdownlist.
                            var list = ['Germany', 'Brazil', 'France'];
                            editor.jqxDropDownList({ source: list });
                        },
                        // update the editor's value before saving it.
                        cellvaluechanging: function (row, column, columntype, oldvalue, newvalue) {
                            // return the old value, if the new value is empty.
                            if (newvalue == "") return oldvalue;
                        }
                    },
                    { text: 'Ship Name', datafield: 'ShipName', columntype: 'combobox' }
                ]