Active X Checkbox Linkage - in worksheet

Hi,

I have got three active x checkboxes in the workbook, one in the each different worksheet.

I want a way, if I click on any of this checkbox, the other two checkboxes enables too and same goes for the disable action.

Any idea if it can be acheived.

Please note that the worksheets are protected, so any code would require unprotecting the worksheets and then protecting it again (As I want them to be protected).

Regards

Umesh Banga