shoeson 0 Newbie Poster

Hi there
i am using Expression Blend 3 to design the GUI for an application.
In the GUI i have a list box which contains 40 text boxes.
The textboxes are arranged in a tabular form consisting of 8 textboxes in a row.
the problem i am facing is that i am unable move through those textboxes by pressing TAB key.
Each time i focus a textbox and then press the tab key the focus moves to other objects on the screen like buttons and menubars. What i wanted to do is that on pressing the tab key the cursor should move through the textboxes on the list box.
i tried setting the tabindex property of the first textbox to 0 second to 1 third to 2 and so on but it didn't work.

and also every controls on the GUI have a tabindex of 2147483647 which is automatically assigned by the system.

please help.