treeview problem

Hi! We have a problem about treeview. Our application is keep on encountering index out of bounds when we want to display all the data in treeview.This problem will occur when we want to add another value to the treeview during runtime and then close the application. The next time you open the application it will display an error index out of bounds.We check already the capacity limit of treeview and we think that our data did not exceed on that limitation.

I think this is due to a bug in the program.
May be the listitem(index). Some index value specified may not be available.