How to Clone Gridview Columns in WPF?

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C#

WPF

C#4.0

Telerik

Dear All,
I have a WPF Telerik Gridview, when i am trying to export the gridview to Excel some of the columns are vanishing, How can i clone them and get those gridcolumns back while exporting and after exporting as well?
I tried the following link but still no success.
http://stackoverflow.com/questions/32541/how-can-you-clone-a-wpf-object[^]
I also tried making columns visibility to 'true' and 'false' as well.
Can any one help me out with this issue?