Set properties in Visio static structure shape - C#.net 2008

Question

Dear all,
I'm using C#.net 2008 and Visio 2007.
in my forms application I use an axDrawingControl to render UML static structures. I use the stencil UMLSTR_M.vss and dropped a shape 

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newShape = currentPage.Drop(currentStencil.Masters["Class"], 3.00, 10.00);

I can change the name of the class

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foreach (Visio.Shape tempInnerShape in newShape.Shapes)
{
    if (tempInnerShape.Name == "Name")
    {
          tempInnerShape.Text = "Student";
    }
    if (tempInnerShape.Name == "Attributes")
    {
      //tempInnerShape.Text = "temp Operations" //ERROR
    }
}

But I cant set text for attributes. Can read all attributes and Operations from an already drawn class but can not set.
Please help me to do the task.
Thank you