How to fix error when overriding a ListView

[Ba ranh]

When dragging on the form, an error occurs.

#include "MyComponent.h"

using namespace System;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;

public ref class FlickerFreeListView : public ListView
{
protected:
    virtual void WndProc(Message m) override
    {
        // Filter WM_LBUTTONDBLCLK
        if (m.Msg != 0x203)
        {
            ListView::WndProc(m);
        }
    }
};

Error : Failed to load toolbox item it will be removed from the toolbox