private: System::Void Panel_MouseDown(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e) {
        this->dragging = true;
        this->offset = Point(e->X, e->Y);
    }
    private: bool dragging;
    private: Point offset;
    private: System::Void Shell_Load(System::Object^  sender, System::EventArgs^  e) {
        this->dragging = false;
    }
    private: System::Void Panel_MouseMove(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e) {
        if (this->dragging) {
            Point currentScreenPos = PointToScreen(e->Location);
            Location = Point(currentScreenPos.X - this->offset.X, currentScreenPos.Y - this->offset.Y);
        }
    };
 
    private: System::Void Panel_MouseUp(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e) {
        this->dragging = false;
    }
    private: System::Void Button_Click(System::Object^  sender, System::EventArgs^  e) {
        Close();
    }

offset = PointToScreen(e->Location) - (Drawing::Size)this->Location;