IDEA plugin can not open "Inject..." window

IDEA plugin doesn’t open “Inject…” window from Java controller if xml descriptor has additional namespace: xmlns:ext=“http://schemas.haulmont.com/cuba/window-ext.xsd

Hi,
In my environment, everything works well. So could you answer a couple of questions:
Which version of IDEA do you use? Have you upgraded the plugin to the latest version?
Could you share the whole XML of the screen?