当更改当前签入到源代码控件的文件时，出现此错误。
This error arises when a change is made to a file that is currently checked in to source-code control.
它提供了自动或即时的代码检入和检出、简洁的修饰符，从而可以轻松地标识源代码控件中的对象及其状态。
It provides automatic or prompted check-in and check-out of code, neat decorators to easily identify which objects are in source control, and their status.
图3所示树控件的源代码见清单4。
The source code for the tree controls shown in Figure 3 appears in Listing 4.
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