Tab index not working properly with user controls

[dashingsidds]

Hi Experts, I have a window which is having some objects of a user control. The user control is nothing but a combination of label and textbox. I have set the tabindex property of these objects in certain order but when i run the window that order is not maintained. This is working fine if i use normal wpf controls like the normal textbox or button. Am i missing something? Please help! Thanks in advance! Regards, Samar