use c# calling script addunit via com, how can I save the changes before quit.

TestComplete.ITestCompleteCOMManager TestCompleteManager = (TestComplete.ITestCompleteCOMManager)TestCompleteObject;

TestComplete.ItcIntegration IntegrationObject = TestCompleteManager.Integration;

 

IntegrationObject.OpenProjectSuite(sProjectSuitName);

TestComplete.ItcProjectIntegration project = IntegrationObject.get_Project(sProjectName);

project.AddUnit(scPath);  // add success

 

but when i want to quit testComplete (i  use "TestCompleteManager.quit " to quit), 

the testComplete  reminds me if save the changes in testComplete(see the attach picture)

 

but I didn't find any method to save the changes before  quit.

 

so if i add a new scriptunit and i want to  save the project,

which method should i use,before i call the "TestCompleteManager.quit "method?

or set the testComplete auto save the  changes before quit?

tks