How to make changing from base class view to scrollview using MFC?

I have made a programm of view/document model. But now it is needed to replace view with scrollview . I modified view class by replacing base of common view with SCrollView by hand . And I changed message mapping  and some other resource code. The result of modification is that the file can pass through compiling and linking,but occured the following errors when runing.
  Debug Assertion Failed!
  program:\Degug\My_file.exe
  File:viewscrl.cpp
  Line:220
cdq_chanceAsked:
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freewellCommented:
You are required to handle the  OnInitialUpdate() of ScrollView
void CMyScrollView::OnInitialUpdate()
{
      CScrollView::OnInitialUpdate();

      CSize sizeTotal(100,100);
      // TODO: calculate the total size of this view
      SetScrollSizes(MM_TEXT, sizeTotal);
}
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cdq_chanceAuthor Commented:
I am very appreciative for your comments.you give me some information for dealing with this question.In fact, I did what you wrote before, but I couldn't solve the problem.Now,I have solved it by the instruction of my companion.My mistakes lie in the second parameter of function SetScrollSizes(). I applied a action to provide a value of the second  parameter and the method is wrong.
Thanks for your comments. Could you tell me your email address? wish you all best.

                                    cdq_chance
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