When the control is selected for the first time after you switch from Source view.
在从“源”视图切换到“设计”视图后第一次选择控件时。
Example is a firstly position control then immediate switch to load control in real time.
例如，首先是位置控制，然后立即切换到加载实时控制。
Example is a firstly position control then immediate switch to load control in real time.
例如，首先是位置控制，然后立即切换到加载实时控制。
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