要到WPF在执行阶段将物件树状结构执行个体化时，才会呼叫型别转换子。
Type converters are not called until the object tree is instantiated by WPF at runtime.
此外，如果视觉化树状结构的变更强制更新复合场景图形，也会呼叫事件处理常式方法。
In addition, if changes to the visual tree force updates to the composition scene graph, your event handler method is also called.
如果在呼叫项目上找不到资源，则会改以搜寻逻辑树状结构内的父项目，接著搜寻应用程式、布景主题，最后则会搜寻系统资源。
If the resource is not found on the calling element, the parent element in the logical tree is searched next, then the application, then themes, and finally system resources.
应用程序可以呼叫这个方法以确保某个项目的视觉化树状结构已完成。
Applications can call this method to guarantee that the visual tree of an element is complete.
此外，如果变更视觉化树状结构会强制更新复合树状结构，则也会呼叫您的事件处理常式。
In addition, if changes to the visual tree force updates to the composition tree, your event handler is also called.
此外，如果变更视觉化树状结构会强制更新复合树状结构，则也会呼叫您的事件处理常式。
In addition, if changes to the visual tree force updates to the composition tree, your event handler is also called.
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