>ok, my case for example,
> My boss in his computer write a program (it has only A form ) , but he want to give me to improve....
>In this time , he only give me 3 file, extention A.vb , A.resx and A.designer.vb.
>So i new the project and add the 3 exits file, and rebuild , but i can't see all of control
>(In Solution Explorer 's view designer ), how can i do?

Right click the project where you wish to add the form. Select Add/Existing Item. Navigate to and select the *.vb file