Call listbox method from a container control

I have a container control which contains a listbox and a container control with some buttons.
After clicking a button, how can I call a listbox method ?

something like: MyContainer(me.Window).Listbox1.addrow"new text"

in the buttons action event maybe?

Add events to the container and pass the button presses on to the window. Let the window broker the communication between containers.

thanks Tim, that’s the way I’m going to do it,
danke Maximilian