Grid loosing tab focus

Hi i am using text box and combo for each row in the gird. I reach last row textbox of the grid, now i can press the tab control. the focus loosed from the grid.So, here i want to focus in to the first row textbox of grid. how i can achive this? please help me anyone. Now i am using AW2.5

Maybe you need to add an event handler for tab key -

grid.onKeyTab = function(event){
...
}

http://www.activewidgets.com/aw.system.control/control-keyboard-events.html

Nope, i have been already added the tab events.