public virtual void AppendPage()
{
MakeLastPageBreak();
// TODO-Later: Layout of New Page is the same with LastPage
// TODO-Later£º PageRepository use LayoutFactory.CreateDefaultLayout(), Depends on File system, not good to UT
// TODO-Later: Make Project Model not Dependent on Project Adapters
Add(PageModelFactory.CreatePageModel(LayoutFactory.CreateDefaultLayout()));
var lastPageNO = Count - 1;
FocusIndex = lastPageNO;
PageChange(lastPageNO);
}