Initiate the Tool Window programmaticaly

Hi, according the Tool Window guide ( here: https://plugins.jetbrains.com/docs/intellij/tool-windows.html#programmatic-setup) one should use the ToolWindowManager.registerToolWindow()

The problem is, all the overloads of this method are either Internal or deprecated. Can somebody please help with a minimal code that uses the valid, non-internal API to initialize a ToolWindow programmatically?