Pass Content Query Web Part ToolPart Value to XSL

Question

I have extended the Content Query Web Part by adding a textbox control ToolPart.  This is working, i.e.  I am able to see the control, add a value in the textbox and save it.  Is it possible to pass the value of this ToolPart textbox to the
xsl file?  I found this article: http://blog.sharepointexperience.com/customitemstyle/ that describes how to first see all fields being passed to the webpart by creating a temporary
itemstyle with this code: 
<xsl:for-each select="@*">P:<xsl:value-of select="name()" /></xsl:for-each>
I believe I next need to modify CommonViewFields of the *.webpart file to include the fields I would like to pass to xsl.  
My question is how do I know the name of the field SharePoint is using to store the value of the textbox toolpart?  The toolpart textbox is generically named (i.e. _textbox), so I do not think I can derive the the field name from the textbox created
in code.

Answer 1

try these links:
http://blogs.msdn.com/b/ecm/archive/2006/10/25/configuring-and-customizing-the-content-query-web-part.aspx
http://msdn.microsoft.com/en-us/library/office/bb447557(v=office.14).aspx
http://msdn.microsoft.com/en-us/library/office/bb850574(v=office.12).aspx
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