Could not find type… Please make sure that the assembly that contains this type is referenced

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C#

C#4.0

user-controls

generics

I created a Generic User Control with following signature..

public partial class GridMastercontrol<TMainEntity, TChildEntity> : UserControl
where TMainEntity : class
where TChildEntity : class
{
// more code here
}

A reference is created as follows-

GridMastercontrol<STACS.ACASupp,STACS.ACALot> ctlMasterACA=new GridMastercontrol<STACS.ACASupp,STACS.ACALot>();

The control works perfectly on run-time. But, when i open the designer the design is not displayed and the following two warnings popup-

Warning 1- Could not find type 'WindowsFormsControlLibrary1.GridMastercontrol'. 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 using settings for your current platform or Any CPU.

Warning 2- The variable 'ctlMasterACA' is either undeclared or was never assigned.

It was working perfectly in design mode when i did not implement the generics concept into it. but now, it does not. :(

Please help me.. Thanks in advance :)