Need guide line to understand a datagridview and virtual mode code c#

[Mou_kolkata]

i got a nice code where i made some change as per my requirement and the code is working. i got the code from MSDN. few area still not clear

1) i saw function getting called when we place a mouse over grid or scroll grid. the function name is RetrieveElement() but i found no relation between grid mouse over and scroll with this function call. so i request some one please go through the code and help me to understand what is the relation between function call RetrieveElement() and grid mouse over?

i apologized that i could not post my full code due to post length restriction.

the same issue posted in this SO forum with full code. so some one please have a look and guide me to understand the issue.

http://stackoverflow.com/questions/31516269/need-guide-line-to-understand-a-datagridview-and-virtual-mode-code-c-sharp

thanks

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