Frustrated With Wpf DataGrid - wpf-controls

I have a tabcontrol and I place datagrid inside a tabcontrol... But I could not focus that Datagrid at the load event ... Focus means I couldn't navigate through keyboard into it... I'm getting this problem only inside of the tab control otherwise it works fine...my sample project link as follows..
http://cid-0255f3152326d2b1.skydrive.live.com/browse.aspx/WPF%20Datagrid%20Problem?uc=1&nl=1
Please remember note that focus means I couldn't navigate a datagrid through keyboard
It should be in load event......Because it works fine in other events...
Datagrid should be placed inside a tab control... Because it works fine outside a tab control.....
I hope u wil help me... please help me out
Thanks in Advance

Sorry dude,
I had found an answer from
http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/1523d1c4-581d-44a9-86d8-61adb54ab2fb
Thanks,

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