VBA User Form to open file not setting focus on the opened file

I have created a User form with different buttons to open the various files. However, when I click a button to open a specific file, the opened file is not automatically activated (set focus).
How do get the last opened file activated?

If I click the button pmt (below) to open a payment file, Excel does not activate the pmt file opened but the focus remains on book 1 (or the previously open workbook)




I have created the following 3 codes to open the "pmt" file


Sub Open_Selected()

fmOpenFiles.Show

End Sub


Private Sub cmdPayments_Click()
Open_Payments
Unload Me
End Sub


Sub Open_Payments()

Dim file As String

file = "D:\My files\Payments.xlsx"

Workbooks.Open filename:=file

End Sub