If you want to designate a cell to open another sheet you could Hyperlink to that sheet.
Right click cell in the dropdown pick Hyperlink|Pick Your Workbook then Click Bookmark|Select sheet desired.
Or you could create a toggle button
Go into design mode place a togglebutton onto the sheet and right click, in the dropdown click view code. place this code between Private sub Togglebutton1_Click() and End Sub
Change sheet1 to the name of the sheet you are wanting to open. Also make sure to hide the sheet before clicking the button.
hope this helps
Bookmarks