How to fix error when overriding a ListView

Ba ranh (33)
When dragging on the form, an error occurs.

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#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
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