Load userform on opening .xlsm file and completely hide worksheets.

[arsenal_fan]

Hi,

I am using excel to load a userform that will run a macro to perform processing on excel sheets. I have set the userform to load when you double click the macro-enabled excel sheet. Everything works fine except I can briefly see worksheets before the userform appears. How do I ensure that worksheets arent visible even briefly when I double click
the macro-enabled excel sheet. I'd like the userform to load right away.

My ThisWorkbook code:

Private Sub Workbook_Open()
    Application.ScreenUpdating = False
    userform.Show
    Application.Visible = False
End Sub