(1) EditorGridPanel: Added method called focusNextCell to startEditing the next eligible cell to the right of the last edited cell.
(2) FinderComboGrid: When the user selects a record from grid, after the gridWindow is closed, grid.focusNextCell is called.
(3) GridView: Updated the refreshRow method to pass column.editable into the cell template, so that editableCss is added when the column is editable.
