wpf binding textbox to master

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C#

WPF

VS2010 .net4 wpf

Hi,

I have a dataset with several tables lets say Order and OrderItem, and a window whos datacontext is set to the OrderItem table.

The OrderItem has an OrderID field, but I dont want to display the OrderID, how can I display the OrderName from the Order table when the datacontext of the window is the OrderItem table?

It is working fine for Comboboxes as I can set the xaml as follows:
Set the ItemSource for the combobox to the Orders table

SelectedValue="{Binding Path=OrderID}" // orderID from OrderLine 
DisplayMemberPath="OrderName" // orderName from order table
SelectedValuePath="OrderID" // orderID from order table

How can i get the same result with a text box, ie display the description knowing the ID?

Thanks,
Chas