animate canvas项目，使用组件后，怎么判断，所有的组件都初始化完成？

In animate, I used the official custom component method to customize an IFrame component, and then prepare to add SRC to the IFRAME after initialization (because this src is dynamic); currently found in the canvas project, the first frame code is assigned an IFRAME src time, found at this time canvas initialization completed, but the IFRAME has not been initialized to complete, will cause errors. So want a component to create the completed event listener.

like this, the timeline code priority in front of the component creation, can change the Settings by in adobe animate, solve the problem?