[Pharo-project] New widget

[Benjamin]

Hello everyone,

I've done a new Morphic widget, that allow to easily switch from a categorized 
view to a "all elements" view (quite hard to explain, let me give you an 
example ^^)



Gofer new
        squeaksource: 'SwitchableTreeWidget';
        package: 'SwitchableTreeWidget';
        load.
        
SwitchableCategoriesTreeExample new openInWorld.

If you click on the button or just double click on the tree, you will switch 
the view :)

I wrote that widget to integrate it in a new browser (and if I succeed, to 
create a new Glamour widget)



Thanks in for your feedback :)


Ben