if (column.format === 'd') {
            if (column.customEditor) {
                column.customEditor.dispose(); // Dispose method to be implemented in CustomGridEditor
            }
            column.customEditor = new CustomGridEditor(theGrid, column.binding, wijmo.input.InputDate, {
                format: 'd',
                isRequired: false,
                value: null
            });
        }

CustomGridEditor.prototype.dispose = function() {
        // Remove event handlers from the grid
        if (this._grid && this._handlersAdded) {
            this._grid.beginningEdit.removeHandler(this._beginningEditHandler);
            this._grid.sortingColumn.removeHandler(this._commitRowEditsHandler);
            this._grid.scrollPositionChanged.removeHandler(this._scrollPositionChangedHandler);
            this._grid.selectionChanging.removeHandler(this._selectionChangingHandler);
            this._grid.lostFocus.removeHandler(this._gridLostFocusHandler);
        }

        // Remove event handlers from the control
        if (this._ctl) {
            this._ctl.removeEventListener('keydown', this._keydownHandler, this._ctl.hostElement);
            this._ctl.lostFocus.removeHandler(this._lostFocusHandler);

            if (this._ctl.dispose) {
                this._ctl.dispose();
            }
        }

        // Remove event handler for window resize
        window.removeEventListener('resize', this._resizeHandler);

        // Clear references
        this._grid = null;
        this._col = null;
        this._ctl = null;
        this._handlersAdded = false;
    };