Component not visible in Designer , but compiles and runs fine - Visual Studio 2010

I've been working with VS 2010 for a few weeks with no problems after upgrading to Win 7 64bit.  My solution (a windows forms database project using ADO.NET to view and manage a SQL Server DB) has been compiling and running fine throughout.
I just finished deleting and re-placing a Dataset in the project inorder to make it current with changes made to the SQL database.

The solution still compiles and runs fine.

However , the problem is in the VS IDE - in design mode, I cannot see one of the main controls ( a custom UserControl) that is contained in a GroupBox container.  All the code to generate the component exists in the designer, but when I look at the Document Outline, it does not exist.  It is not "Sent toBack" or anything.

Also, I did get an error once when trying to save changes while in this condition, error message something like " could not load the file or assembly XXXXXXXXXX ."

All my Google searches come up empty.  

All the code to generate the component is still there - it's just not loading into the IDE for some reason.

Any ideas??

cmh_rwhelanAsked:
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Anurag ThakurTechnical ManagerCommented:
it might happen due to some bug in the designer of VS 2010
I was just checking on google about visual studio 2010 designer bugs and there are a lot of issues reported by the users
Try updating VS 2010 to SP 1 may be it will resolve the issue
SameerJagdaleCommented:
also do have a look at initializecomponent() method, most of the time we overlook it.
cmh_rwhelanAuthor Commented:
I've installed VS2010 SP1 - no change in the behaviour.  The InitializeComponent method is being called OK when run in debug.   I am targeting Any CPU during build,  and the solution compiles and runs fine, but both in the IDE and running in Debug, the component ( derived from a winforms tab control ) is not visible.

The dataset replacement operation that I performed prior to the bug showing up was not a new operation;  I have deleted and replaced the dataset numerous time in the development.

Any other ideas?

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Anurag ThakurTechnical ManagerCommented:
Not really, you can try contacting microsoft for further help on the issue
MathiyazhaganCommented:
Have you checked that your project is having any dead reference (A refered project is not available and it is not used currently- so project is compling, which will be displayed with yellow warning icon in solution explorer) ?. Because, The designer will  load all refered assemblies before show a form. if loading is failed, the controls won't be populated. if you any dead reference, remove it and compile solution. close VS IDE and  reopen the solution.

Hope this helps.
SameerJagdaleCommented:
try cleaning the solution, closing and re-opening the IDE, de-referencing and re-referencing the assemblies and then Re-building the entire solution.

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cmh_rwhelanAuthor Commented:
The reference for the component must have been broken at some point - though not sure why..

cleaning and re-refenencing the same assembly (still at the same file location) seemed to fix it.

thanks Sameer - saved me a lot of work.  

Greetings from Canada.

RW
SameerJagdaleCommented:
Glad to know. Enjoy!
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