Excel-Active X Combobox, Selecting Sheets

Hi,
Am a newbie in trying to automate Excel.
I have a workbook with 50 worksheets and a menu sheet.
On the menu sheet I created an Actixe X combobox filling it
with the fifty sheets.
I wish to be able to select from the combo box to go to a
particular sheet. I am using the following code which works fine
if I select and click but when I enter an alphabet it goes direct
to the first sheet with which the alphabet starts rather then giving
me any options to select.

Private Sub ComboBox1_Click()
If Me.ComboBox1.Value <> "" Then Sheets(Me.ComboBox1.Value).Activate
ComboBox1.Value = ""
End Sub

Please note I have posted this on another blog.