private void createModel() {
   myTestGrid = createTestGrid();
   myModel =
       new TestGridGridModel(
           EditingDomainUtils.getEditingDomain(),
           myTestGrid,
           TestModelPackage.Literals.TEST_GRID_CELL__DETAILS,
           null);
   myCellA1 = myTestGrid.getColumns().get(0).getCells().get(0);
   myCellB1 = myTestGrid.getColumns().get(1).getCells().get(0);
   myCellC1 = myTestGrid.getColumns().get(2).getCells().get(0);
   myCellA2 = myTestGrid.getColumns().get(0).getCells().get(1);
 }