"ScreenUpdating = False" From A Userform

I have a command button on the first sheet of my workbook that opens a Userform. The following stages are simplified so as to not confuse the problem I am having. The user enters a word into a Text Box in the Userform, and when they click OK (Command Button), the second sheet of the same workbook activates, and the macro finds the word from a list in Column A. It then makes that cell the Activecell and then activates the first sheet again before closing.

The problem is that I would like all that to happen with Screen Updating turned off, so the user doesn't see the sheets change. For some reason, I can't get it to work. From my research, I have read that Screen Updating should not be turned off until after the Userform opens, or if you move the Userform around the page it will work as an eraser. So I presumed I had to add to the Search Button


Private Sub SearchButton_Click()
Application.ScreenUpdating = False
Sheets("Sheet2").Activate
'\The rest of the code follows here
so that when you click the Search Button the first thing it does is turn off Screen Updating. But for some reason this doesn't work.

I also tried adding the code into the sub that calls the Userform:


Sub OpenUserform()
UserForm1.Show vbModeless
Application.ScreenUpdating = False
End Sub