In my project there is one scrollable table and one “not scrollable” (the first two columns are fixed). In the scrolling table, I have buttons:

(source: cs625116.vk.me )
When scrolling a table, these buttons, for some reason, are drawn over a non-scrolling table (a table with headers).

(source: cs625116.vk.me )
Such a problem arises only with them, nor how can I figure out what the problem is = (