how can worksheet_activate event of active sheet work of active workbook

I have a workbook which contains several sheets. On every sheet i put worksheet_activate event for re size windows size. But when i open another workbook and come back on previous workbook, worksheet_activate event does not work of this workbook. When I go any other sheet of this workbook then it works quite well.
Is it possible to solve this in simple way.

You need to use the Workbook_Activate event as well.