Swap mouse buttons for ViewerListerner

[<mauricio0copo AT gmail.com>]

Hello,

Well ...the title says it all. The ViewerLister activates events for left
button clicks. Right button clicks just move the node around. Since my 
listener
is used to create a window that displays info about the clicked node, it would
make more sense if I used the right button for that and the left button for
moving. By now I'm trying to get a solution with java.awt.Robot, but I'd 
rather
ask first if there's an easier way before doing the hard way :)