3 added 187 characters in body
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You should override _prepareColumns function inside your custom block

Class abc_Addressmanager_Block_Adminhtml_Stores_Csv extends Mage_Adminhtml_Block_Report_Grid_Abstract {

     protected function _prepareCollection()
     { 
          //please make sure to set collection here and having all columns you want to load in the query
     }

     protected function _prepareColumns()
     {
        //for debuging
        $collection = $this->getCollection();
        //printing the query using this command (if $collection object is set)
        echo   $collection->getSelect();
        //making sure the fields you want to show up is in the query output
        //you can add or remove columns here
     }    

}

You should override _prepareColumns function inside your custom block

Class abc_Addressmanager_Block_Adminhtml_Stores_Csv extends Mage_Adminhtml_Block_Report_Grid_Abstract {

     protected function _prepareColumns()
     {
        //for debuging
        $collection = $this->getCollection();
        //printing the query using this command (if $collection object is set)
        echo   $collection->getSelect();
        //making sure the fields you want to show up is in the query output
        //you can add or remove columns here
     }    

}

You should override _prepareColumns function inside your custom block

Class abc_Addressmanager_Block_Adminhtml_Stores_Csv extends Mage_Adminhtml_Block_Report_Grid_Abstract {

     protected function _prepareCollection()
     { 
          //please make sure to set collection here and having all columns you want to load in the query
     }

     protected function _prepareColumns()
     {
        //for debuging
        $collection = $this->getCollection();
        //printing the query using this command (if $collection object is set)
        echo   $collection->getSelect();
        //making sure the fields you want to show up is in the query output
        //you can add or remove columns here
     }    

}
2 added 288 characters in body
source | link

You should override _prepareColumns function inside your custom block

Class abc_Addressmanager_Block_Adminhtml_Stores_Csv extends Mage_Adminhtml_Block_Report_Grid_Abstract {

     protected function _prepareColumns()
     {
        //for debuging
        $collection = $this->getCollection();
        //printing the query using this command (if $collection object is set)
        echo   $collection->getSelect();
        //making sure the fields you want to show up is in the query output
        //you can add or remove columns here
     }
     

}

You should override _prepareColumns function inside your custom block

Class abc_Addressmanager_Block_Adminhtml_Stores_Csv extends Mage_Adminhtml_Block_Report_Grid_Abstract {

     protected function _prepareColumns()
     {
        //you can add or remove columns here
     }
 

}

You should override _prepareColumns function inside your custom block

Class abc_Addressmanager_Block_Adminhtml_Stores_Csv extends Mage_Adminhtml_Block_Report_Grid_Abstract {

     protected function _prepareColumns()
     {
        //for debuging
        $collection = $this->getCollection();
        //printing the query using this command (if $collection object is set)
        echo   $collection->getSelect();
        //making sure the fields you want to show up is in the query output
        //you can add or remove columns here
     }    

}
1
source | link

You should override _prepareColumns function inside your custom block

Class abc_Addressmanager_Block_Adminhtml_Stores_Csv extends Mage_Adminhtml_Block_Report_Grid_Abstract {

     protected function _prepareColumns()
     {
        //you can add or remove columns here
     }


}