problem with MS Word Add-In

Hi everybody,

I have created an Add-in for MS Word. It is a toolbar that contains a button when you click on button it loads a Form.

My version of office is 2003,

It works well, but with a few problems. if you assume that we have 4 cases it works at two of them. here is the 4 cases:

1.if you double click on a .doc file to open it, everything goes well (my button works).

2.if you open a new instance of Word, and use the document as a new document everything goes well here too.

3. if you have already opened a new instance of word and go to file -> open (as usual when you open an exsiting .doc file) it does not work, my button does not opens the form.

4.if you have uploaded a .doc file to Shared Documents on a Sharepoint Site and want to open it, my Add-in does not work.

here is a bit of my code:

[GuidAttribute("79CC5244-EADC-4F4B-ACF1-9387460BEDF4"), ProgId("IgnitoAddIn.Connect")]
 public class Connect : Object, Extensibility.IDTExtensibility2
{
   //-------
   my variables
  //-------
  public Connect()
  {
  }
public void OnConnection(object application, Extensibility.ext_ConnectMode connectMode, object addInInst, ref System.Array custom)
 {
   applicationObject = application;
   addInInstance = addInInst;

   SetApplicationFields(application);
   CommandBar toolBar = null;
           
   toolBar = AddWordToolbar(wordApp, "Ignito Toolbar");
 
MyButton = this.MakeANewButton(toolBar, "View Tree", 1000, new _CommandBarButtonEvents_ClickEventHandler(MyButton_Click));

}

 public void OnDisconnection(Extensibility.ext_DisconnectMode disconnectMode, ref System.Array custom)
  {
  }

public void OnAddInsUpdate(ref System.Array custom)
 {
 }

public void OnStartupComplete(ref System.Array custom)
{
}

public void OnBeginShutdown(ref System.Array custom)
{
   MyButton.Enabled = false;
}

private void SetApplicationFields(object application)
{
   wordApp = (Word.Application)application;          
}

private CommandBar AddWordToolbar(Word.Application word, string toolbarName)
{
  CommandBar toolBar = null;
  try
  {
      object missing = System.Reflection.Missing.Value;
      toolBar = (CommandBar)wordApp.CommandBars.Add(toolbarName, MsoBarPosition.msoBarTop, missing, true);
      toolBar.Visible = true;
      return toolBar;
   }
   catch
   {
      return null;
   }
}

private CommandBarButton MakeANewButton(CommandBar commandBar, string caption,int faceID, _CommandBarButtonEvents_ClickEventHandler clickHandler)
{
   object missing = System.Reflection.Missing.Value;
   try
   {
      CommandBarButton newButton;
      newButton = (CommandBarButton)commandBar.Controls.Add(MsoControlType.msoControlButton,missing, missing, missing, missing);

       newButton.Caption = caption;
       newButton.FaceId = faceID;
       newButton.Click += clickHandler;
       return newButton;
    }
    catch
    {
        return null;
    }
 }

public void MyButton_Click(CommandBarButton SomeButton, ref bool SomeBool)
{
     TaxForm = new Form1(this);
     TaxForm.Show();
}
}