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missing event in RichTextBox

Posted By:      Posted Date: September 03, 2010    Points: 0   Category :Windows Application
I'm developing an application that uses the RichTextBox extensively, I need an event that gets triggered at the moment when the vertical scroll bar of the richTectBox appears . so instead of scrolling down to see the rest of the text I want to create another RichTextBox that will hold the rest of the text which didn't fit in the first one …I want to achieve the same functionality as in MS word. I tried so hard to achieve that functionality but it wasn't successfull … I tried to fake it using the SizeChanged event but it wasn't practical because the size of the richTextBox gets changed a lot during the life time of the application   is there such event in windows forms ? … and if not , is there one in WPF ?

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