编辑框WIN32中重叠的文本

Question

我已使用WM_CTLCOLOREDIT绘制了编辑框的背景颜色，现在在输入/添加文字时，它是重叠的。怎么避免这个？

case WM_CTLCOLOREDIT:
        {
            if(IDC_TEXT1 == GetDlgCtrlID((HWND)lParam))
                {
                    textArea1Brush = CreateSolidBrush(RGB(198, 226, 255));
                    SetBkMode((HDC)wParam, TRANSPARENT);
                    return(LONG)textArea1Brush;
                }

            break;

        }