Update Model from database does not update Nullable Property -- Possible bug?

Hi,
I don't know if this is the correct forum.
When updating Model from database seems does not update the entity nullable property.
and it will not update the Default Value from the Backend (MSSQL) also.
I am using VS2008 SP1 3.5EF, XP64Bit Machine.
Thanks
vb.net GUI

maybe related..
today.. i changed the PK size.. from char(10) to char(36)
got many problems.. easy to fix...
but some query stop working:
Table1Record.Table2Reference.Load(); //i'm trying to load table2 from table1..
throw this error: A relationship multiplicity constraint violation occurred: An EntityReference expected at least one related object, but the query returned no related objects from the data store.
i get this error only when PK is greater than char(10)...
with SQL profiler.. i saw that PK was truncated to char(10) :
exec sp_executesql N'SELECT [... some fields...]
FROM [dbo].[Table1] AS [Extent1]
INNER JOIN [dbo].[Table2] AS [Extent2] ON [Extent1].[NoTable2] = [Extent2].[NoTable2]
WHERE [Extent1].[NoTable1] = @EntityKeyValue1',N'@EntityKeyValue1 char(10)',@EntityKeyValue1='a2164b14-e'
(NoTable1 is the PK changed from char(10) to char(36))
i'm working with VS.NET 2008
so, i looked at Model1.Edmx... in notepad
CSDL was not changed when i did the "Update Model from Database" !!!
here is SSDL part:
        <EntityType Name="Table1">
          <Key>
            <PropertyRef Name="NoTable1" />
          </Key>
          <Property Name="NoTable1" Type="char" Nullable="false" MaxLength="36" />
here is CSDL part:
        <EntityType Name="Table1">
          <Key>
            <PropertyRef Name="NoTable1" />
          </Key>
          <Property Name="NoTable1" Type="String" Nullable="false" MaxLength="10" Unicode="false" FixedLength="true" />
Cool.. i found the prob.... but why ? and how to correct this ? manually change Model1.Edmx in notepad ??
why the maxlength property is readonly in Model Browser pane ??
what about VS.NET 2010 ?! same prob ??
is it a bug or by design ?
I hope this can help someone.. I spent a few hours on this prob
Patrick

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