Combo Box (Form Control) not refreshing on "Workbook_Open"

I have this code which assigns a macro to a drop down on workbook open.
Drop down is a Combo Box (Form Control) from the Developer tab.
When I open the workbook, the drop down should say "Select Section".
If I remove the line "Worksheets(1).Select" it works. But I need this line.
Is there any way to make it work with this included?

THIS WORKBOOK

Option Explicit

Private Sub Workbook_Open()
    Call DropDownAssign 'For assigning macros to Drop Downs
End Sub

MODULE

Option Explicit

Sub DropDownAssign()
    Dim dd As DropDown
    Worksheets(1).Select
    Set dd = ActiveSheet.DropDowns("Drop Down 1")
    dd.Text = "Select Section"
End Sub

Sub DropDownCalculationSnapLevel1()
    Dim MyDropDown As DropDown
    Set MyDropDown = ActiveSheet.DropDowns("Drop Down 1")
    If MyDropDown.ListIndex > 0 Then
        ActiveSheet.Cells.Find(Trim(MyDropDown.List(MyDropDown.ListIndex)), lookat:=xlPart, SearchOrder:=xlByColumns).Select
        MyDropDown.Text = MyDropDown.List(MyDropDown.ListIndex)
        MyDropDown.ListIndex = 0 'Workaround to allow the same selection
    End If
End Sub