Using VB in Excel

[lluis_escude]

It's the first tiem I try to write VB code in an Excel spreadsheet and can't get it to work.
I have a book with a number of sheets, in one of them is a combo I'd like to have automatically filled with the names of all the sheets when the file is opened.
I've tried to add some code to the Worksheet_activate event, yet to no avail. What is the right object and event to put my code in?

[Nitro]

Right click on an empty error next to the toolbar. Select the FORM toolbar. Drop either a listbox or combobox on the form and right click to select FORMAT CONTROL. Go to the CONTROL tab and select the INPUT RANGE icon. Click on COLUMN A and hit ENTER. Close the dialog box. Run the following codes!

Sub Macro1()
  Cells.Clear
  Dim int_X As Integer
  For int_X = 1 To Worksheets.Count
    Sheets("Sheet1").Select
    Cells(int_X, 1).Value = Sheets(int_X).Name
  Next
End Sub

[lluis_escude]

Thanks for the hint, but how do I have the macro automatically execute when I open the spreadsheet file?

Originally posted by Nitro
Right click on an empty error next to the toolbar. Select the FORM toolbar. Drop either a listbox or combobox on the form and right click to select FORMAT CONTROL. Go to the CONTROL tab and select the INPUT RANGE icon. Click on COLUMN A and hit ENTER. Close the dialog box. Run the following codes!

Sub Macro1()
  Cells.Clear
  Dim int_X As Integer
  For int_X = 1 To Worksheets.Count
    Sheets("Sheet1").Select
    Cells(int_X, 1).Value = Sheets(int_X).Name
  Next
End Sub

[coox]

Right. So, for example, you've got your workbook and it's got three sheets. Your combo is on sheet 1 which is called, for the sake of argument, "Sheet1", and the combo is called "ComboBox1". Ok so far? (you'll substitute your own names here later).

Open the VB editor (open Excel, then hit Alt+F11), and you'll see the guts of your workbook. In the Project Explorer window, double-click on "ThisWorkbook", pick "Workbook" from the top left drop-down and the top-right drop-down will probably default to "Open", which is fine, and it should give you the following:

Private Sub Workbook_Open()

End Sub

Right, stick the following in there:

 With Sheet1.ComboBox1
  For Each sheet In ActiveWorkbook.Worksheets
   .AddItem sheet.Name
  Next sheet
  .ListIndex = 0 
 End With

Now save your workbook, close it, and then open it again, and that should give you what you want. I think...

[Nitro]

Coox is right, Private Sub Workbook_Open() is like Form_load. Place your codes in this event and do an

application.run your macro