public IUndoableEdit AddCombination(Combination combi)
{
if (testCase == null)
{
throw new Exception("The test case cannot be null");
}
CompoundEdit ce = new CompoundEdit();
ce.AddEdit(EditFactory.instance.CreateAddCombinationEdit(testCase, combi));
testCase.AddCombination(combi);
RiskLevelManager rlc = new RiskLevelManager(combi);
ce.AddEdit(rlc.ApplyRiskLevelToChildren());
StateObjectManager som = new StateObjectManager(combi);
ce.AddEdit(som.ApplyStateToChildren());
return(ce);
}