实现对CEdit的贴图操作，控件更加美观。由于在PreSubclassWindow中无法对静态和动态创建该控件作相同的初始化处理，故将静态创建和动态创建单独编写成类。有心人可做相应改动。-Operation to achieve the CEdit textures, controls more beautiful. Since PreSubclassWindow can not create the static and dynamic control for the same initial