RadGridView crashed when scroll with mouse wheel on RowDetails

[Wang]

Hi Guys,

    At this moment , We have used RadGridView 2011.2.712.1040 for our projects.
    
    After radgridview was normally displayed some datas , but when i have scrolled v-scroll bar , the radgridview always crashed by triggering  'RowDetailsVisibilityChanged' event . please kindly see the illustration by attachment.

    I do not know why is it ? how to solve this issue ? 
   
    please give me some advices. I am in urgent need of your help.

    thanks.