Hello,

I have C# add-in for VS2005. From this add-in I create tool
window:

private void InitToolWindow()
{
   if (_MyAddInWnd == null)
   {
       EnvDTE80.Windows2 toolWins =
           (Windows2)_applicationObject.Windows;

       object objOut = null;

       _MyAddInWnd = toolWins.CreateToolWindow2(
           _addInInstance,
           Assembly.GetExecutingAssembly().Location,
           "MyAddInAddIn.MyAddInCtrl",
           "Caption string",
           "{GUID string goes here}",
           ref objOut
       );

      _MyAddInCtrl = (MyAddInCtrl)objOut;
   }
}

Both user control and add-in are in the same assembly, so
everything goes smoothly. Except that user control being
created twice!

When user invokes menu command for my add-in and tool window
becomes visible for the first time, then new user control is
created, so `_MyAddInCtrl' member of `Connect' class has
nothing to do with newly created control.

I tried to use `Window.Object' property instead of member
variable:

InitToolWindow();

MyAddInCtrl addInCtrl =
   (MyAddInCtrl)_MyAddInWnd.Object;
addInCtrl.SomeProp = 42;
...

The result is the same. Once `_MyAddInWnd' becomes visible
for the fist time, new user control is created.

How can I ensure that only one instance of user control is
created?

Thanks in advance
Alex