What am I not understanding about the fluent api?

Hi guys, 

I have set up a widget for the backend of my Sitefinity site that has three textboxes and a button. The goal is to create a new column in the database:

    protected void btnAddClick(object sender, EventArgs e)
    
        Type TelerikType = Type.GetType(txtTelType.Text);
        Type ColumnType = Type.GetType(txtColType.Text);
        string error = "";
        if (TelerikType == null)
        
            error = "Telerik Type is invalid";
        
        if (ColumnType == null)
        
            error = "Column Type is invalid";
        
        if (error.Length == 0)
        
            App.WorkWith()
              .DynamicData()
              .Type(TelerikType)
              .Field()
                   .TryCreateNew(txtName.Text, ColumnType)
                   .SaveChanges(true);
            error = "Added column successfully";
            txtColType.Text = txtName.Text = txtTelType.Text = "";
        
        literalErrorText.Text = string.Format(literalErrorText.Text, error);

    

I am having two problems:

1. When I enter Telerik.Sitefinity.Pages.Model.PageNode into the textbox, Type.GetType(txtTelType.Text) is returning null.

2. If I replace that portion with typeof(PageNode) I get "Specified type 'Telerik.Sitefinity.Pages.Model.PageNode' is not a dynamic type."

I'm hoping somebody might have some insight as to why these things wouldn't work correctly, or possibly a better way to approach this issue? For reference, my goal (at least for now) is to add a dynamic column that references PageNode so that I can specify a ShowInLeftNavigation boolean and a ShowInRightNavigation boolean. Thank you for any help you can provide.

I figured out what I was doing wrong with the TelerikType, I needed to qualify it with an assembly name, so I changed it thusly: 

                      var assembly = typeof(Telerik.Sitefinity.News.Model.NewsItem).Assembly;
            Type TelerikType = Type.GetType(txtTelType.Text + ", " + assembly.ToString());
I would still appreciate a better approach if anybody has any ideas, and I would still appreciate help on the second question, which is 
to say, why isn't pagenode dynamic? Where do I add a column to pages, and how do I access it after I do that? I'm sorry if this is clear
in the documentation, I can't seem to find the right information in there.
            

I guess what I'm really after here is why is PageNode not a dynamic type, and what dynamic type should I use here to attach a column to pages.

Hi Jeff,

 The type you need to use is PageData, not PageNode. Can you check the following thread, that describes the same problem and provides solution:
http://www.sitefinity.com/devnet/forums/sitefinity-4-x/bugs-issues/custom-fields-for-pages.aspx 
If you have any further questions, please do not hesitate to write back.