可以设置Behavior中的Auto属性为True。Auto属性的作用是：Automatically scrolls text to the left when the user types a character at the end of the line.如果是动态创建的CComboBox，Create时加上CBS_AUTOHSCROLL style，应该也可以吧。CBS_AUTOHSCROLL
Automatically scrolls the text in the edit control to the right when the user types a character at the end of the line. If this style is not set, only text that fits within the rectangular boundary is allowed.
Automatically scrolls the text in the edit control to the right when the user types a character at the end of the line. If this style is not set, only text that fits within the rectangular boundary is allowed.
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