How to add the dataContainer?

how to add the dataContainer and dataLoader using uiComponents?

The Entity Inspector creates an entity browser and entity edit screen completely dynamically.
So we have a good example on github.
Here is the screen controller EntityInspectorBrowser: EntityInspectorBrowser.java. See on method createContainer.

If you need to create an Instance Contaiter controller in your code, look at EntityInspectorEditor and method initMainContainer.

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Thank you very much for your help