Could not find type 'SampleListViewPopulation.CustomersBO'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built.  
Could not find type 'SampleListViewPopulation.OrdersBO'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built.  
Could not find type 'SampleListViewPopulation.OrderItemsBO'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built.  
 
Could not find type 'SampleListViewPopulation.ProductsBO'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built.  
The variable 'CustomersBO1' is either undeclared or was never assigned 

I have BO in Solution Explorer but File have a error and dont see a Designer. How i configure Form Example for i see ?