halcon SetPart的缺陷

void ShowRect(int iWideSize)
        {
            hWindowControl1.HalconWindow.ClearWindow();
            hWindowControl1.HalconWindow.SetPart(0, 0, iWideSize, iWideSize);
            HObject rect;
            HOperatorSet.GenRectangle1(out rect, 0, 0, iWideSize, iWideSize);
            hWindowControl1.HalconWindow.DispObj(rect);
        }
        private void button1_Click(object sender, EventArgs e)
        {
            ShowRect(100);
        }        
        private void button2_Click(object sender, EventArgs e)
        {
            ShowRect(200);
        }

private void button2_Click(object sender, EventArgs e)
        {
            HObject img;
            HOperatorSet.GenImageConst(out img,"byte", 2000, 2000);
            img.Dispose();
            ShowRect(2000);
        }