Graphing a Stock
TViewerContentView::HandleModelOrPresenterStateChanged is called in response to a notification from the model or presenter state. TViewerContentView::HandleModelOrPresenterStateChanged signals the beginning of the operation by setting a flag to display "Please wait" to the user, and then begins the operation.
Each TView::Invalidate member function call causes the appropriate view to be redrawn by the View system. TViewerContentView draws the name of the stock and TGraphView draws the graph.
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