select all checkbox at header column of data window

Hi,

I tried to add a check box at header column of data window. It doesn't allow to place check box at header column, it allows to add at detail columns.  my requirement is to place check box at header. once the user select the checkbox all the detail row check box should be selected . So, in tabpage I insert a check box and placed above the date window, It works fine. But the problem is while I do a horizontal scroll the checkbox is in constant position. But in background the data window is scrolling. Is there any function to insert check box into datawindow? Or any process to rectify it?