I successfuly resized the RadarBox interface (The aircraft list etc) by choosing Window/Cascade then dragging the right hand side of the interface so I could see more details in the aircraft list. Maximising the map window then expanded the map to fill the remaining area available - great, just what I wanted.
I now seem unable to repeat this to resize the interface. With the windows cascaded, I can resize the map in its own window, but when I try to "grab" the edge of the interface window, I don't get the double-headed resize arrow to allow me to resize the interface.
I've done this, so I know that it works - how do I do it again?