coding a command button to open a particular worksheet

Hi, I have a command button that I would like to use to view a worksheet when it has been clicked, the code I have below come up with an error:

Object doesn't support this property or method

Private Sub CommandButton1_Click()

Workbooks.("Project.xlsm").Worksheets("interestRateSim").Show
'I also Tried 
'Workbooks.("Project.xlsm").Worksheets("interestRateSim").Visible = True

End Sub

Many thanks for your time