Droppable to dynamic created table problem

Droppable to dynamic created table problem

I had this problem, i want to generate a time table and allow droppable from <ul> list. However when the table is generated dynamic from javascript, the table row cannot be droppable, where nothing hover, active behaviour trigger.
 
However if i prefix the table by default (not dynamic create) i can drag from <ul> list to droppable table specific row.
 
Is that the jquery droppable not function on dynamic created table <tr> or <td>?
 
I search around but nothing related with my problem. Any help will much appreciated.
 
Thanks in advance