Hi Andrea,

Thanks for your posting!!

I will help on your 3 problems one by one:
#1, Defaultly, the Winform datagrid will query the properties of the bound
collection and auto generate the columns with the queried property order.
But, we may control this behavior through explicitly specify several
DataGridTextBoxColumns to the datagrid, each DataGridTextBoxColumn binds to
a property of the datasource object, then the order is determined by our
code. For more details, please refer to DataGridTextBoxColumn class in
MSDN, and the article following:
"Adding Tables and Columns to the Windows Forms DataGrid Control"
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/
vbtskcreatingcustomcolumntypesindatagrid.asp

#2, You may refer to "DataGrid.DataMember Property" in MSDN:
If the DataSource is a DataTable, DataView, collection, or array, setting
the DataMember property throws an exception.
If the DataSource is a DataSet or DataViewManager that contains three
tables named Customers, Orders, and OrderDetails, you must specify one of
the tables to bind to. If the DataSet or DataViewManager contains only one
DataTable, you should set the DataMember to the TableName of that DataTable.

#3, This is a request for deep databinding for Winform datagrid. Currently,
winform datagrid does not support deep databinding, and datagrid can only
query the first level public properties of the item in the colleciton(that
is myProduct's public properties) as columns to display. DataGrid actually
called these first level properties' ToString() method to get the string
representation to be displayed in datagrid cell, so your "Parts" property
of myProduct class can not display its deep property.
If you really want to display a deep property of "Parts" property, I have 2
workarounds:
1, override "Parts" property type class's ToString() method, just return
certain deep property's string representation.
2, The solid solution for this issue is implement ICustomTypeDescriptor
interface for your myProduct , this interface gives "OuterObject" a
description of the properties and enables you to create or remove or modify
the a class's properties at runtime. We can override
ICustomTypeDescriptor.GetProperties method, then find the "Parts" property
and return its certain inner property.

But for DataGrid to query the ICustomTypeDescriptor interface of myProduct
class, we should implement a strong typed collection of myProduct , which
implemented ITypedList interface. Then the DataGrid will call
ICustomTypeDescriptor interface when doing databinding.

For more information, please refer to my original post:
http://groups.google.com/groups?hl=zh-CN&lr=&c2coff=1&threadm=4K6Ioo3fEHA.33
40%40cpmsftngxa06.phx.gbl&rnum=2&prev=/groups%3Fq%3D%2BICustomTypeDescriptor
%2BDataGrid%2BITypedList%2B%2522Jeffrey%2522%26hl%3Dzh-CN%26lr%3D%26c2coff%3
D1%26selm%3D4K6Ioo3fEHA.3340%2540cpmsftngxa06.phx.gbl%26rnum%3D2

For example of how to implement ITypedList and ICustomTypeDescriptor,
please refer to the following article:
http://weblogs.asp.net/fbouma/articles/115837.aspx
http://www.codeproject.com/cs/database/itypedlist.asp?df=100&forumid=15239&e
xp=0&select=491147

Hope these information makes sense to you.
================================================
Thank you for your patience and cooperation. If you have any questions or
concerns, please feel free to post it in the group. I am standing by to be
of assistance.

Best regards,
Jeffrey Tan
Microsoft Online Partner Support