Tableview Iterator in BSP

hi,

I hav created a Controller YCL_example and the interface of this class is IF_HTMLB_TABLEVIEW_ITERATOR.I have used the following methods...

IF_HTMLB_TABLEVIEW_ITERATOR~GET_COLUMN_DEFINITIONS

IF_HTMLB_TABLEVIEW_ITERATOR~RENDER_ROW_START

IF_HTMLB_TABLEVIEW_ITERATOR~RENDER_CELL_START

DO_REQUEST

DO_HANDLE_EVENT

In my View page i hav used htmlb:tableview that uses the table which is generated in DO_REQUEST method.

It works fine.But if i click any check box in my tableview it's thorowing an error page -Page cannot be displayed 'HTTP 500 - Internal server error '.

Anyhelp will be much appreciated..

Rgds,

SAPUSER100