How to pass values to a bindeded method in XAML?

Hi,

I searched around but I haven't found a solution.
I need to do the following..
I have a XML which defines some values like:

<BLOCK id="1"><ITEMS><ITEM id="1" value="0"/><ITEM id="2" value="1"/><ITEM id="3" value="0,0,0,0,0,0,0,0,0"/></ITEMS></BLOCK>

Now I have a class which read this xml and expose two methods:

public class MyXMLReader {
  public String GetValue(int BlockId, int ItemId);
  public void   SetValue(int BlockId, int ItemId, String Value);
}

Then I have a XAML which defines my GUI and I want to bind each control (TextBox, Combo etc..) to a particular ITEM value.
So I have thought to bind the GetValue() method to each controls but, how can I pass the method parameters from the XAML (if this is possible)?

Regards,
Daniele