Create modeless dialog in Intellij IDEA plugin

I want my plugin to keep running in the background when a dialog is shown, so I created a Modeless dialog:

public LogsDialog(@Nullable Project project) {
    super(project, true, IdeModalityType.MODELESS);

    setTitle("Title");
    init();
}

My problem is that this way none of the components are rendered inside the dialog. If I switch the IdeModalityType to anything else, it works just fine.

What is causing the problem? Is this even the proper way to make a dialog asynchronous?

What I want to achieve is to have a window with a textPane where the text is being updated every one second from outside the class