Forms :: Oracle Code To Export Data To Excel

I do the codding procedur in oracle form code to export data to Excel.But when i run the form and call that procedure. The data is come to excel, but it's autometic create a new sheet(as "Sheet4").

The problem is.. How can specify the Sheetname or fix it as "Sheet1"?

---Following it's my code

PROCEDURE Export2EXCEL_FILE(P_MAXCOL_NUM NUMBER) IS
cursor dtl is select * from SG_TMP_REPORT_RESULT
where SOURCE_ID = :BLK_CTRL.NB_SOURCEID
ORDER BY COLTYPE;
row_num number;
col_num number;
cell_val number;

[code]....