magento product grid pagination and searching in edit page tab in custom module
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can anyone help me??

i have created custom module that uses product detail.i have used product grid in add/edit page to select product and it is working fine but the problem is "product grid pagination and searching is not working" it forwards me to client side when ever i click on pagination and search button on product grid.

to create product grid in add page tab i have created one block page with Mage_Adminhtml_Block_Widget_Grid and override all grid method actually i have paste core/Mage/adminhtml/block/catelog/product/grid.php code in my file....

i know the problem that "getGridUrl()" method does not finding the productcontroller url.
thats why the pagination and sorting is not working 

i want product grid with custom column so i cant reuse main product grid i must have to create my own product grid.

plz help me..............
