Hi everyone,
I changed the RTMenuBuilder in Roassal2, especially it's behavior, default colors and added more features as the definition of the highlight color. 
I also changed a bit the architecture but could still be a lot improved. 
We can also add a lot of different features to really specify the look of the menu using the builder so let me know if you have any ideas, comments.
You can have a look with the example 06:
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| v b |
    v := RTView new.    
    b := RTMenuBuilder new view: v.
    b menu: 'add' submenu: '10' callback: [ 
        | es |
        es := (RTLabel new color: [ :tt| Color random ]) elementsOn: (1 to: 10).
        es do: [ :e | e translateTo: ((500 atRandom @ 500 atRandom) - (250 @ 250)) ].
        v addAll: es. 
        v canvas signalUpdate ].
    b menu: 'add' submenu: '20' callback: [ 
        | es |
        es := (RTLabel new color: [ :tt| Color random ]) elementsOn: (1 to: 20).
        es do: [ :e | e translateTo: ((500 atRandom @ 500 atRandom) - (250 @ 250)) ].
        v addAll: es. 
        v canvas signalUpdate ].    
    b menu: 'remove' submenu: 'odd' background: (Color blue alpha:0.3) callback: [ (v elements select: [ :e | e model odd ]) do: #remove. v canvas signalUpdate ].
    b menu: 'remove' submenu: 'even' background: Color red callback: [ (v elements select: [ :e | e model even ]) do: #remove. v canvas signalUpdate ].
    b menu: 'shuffle' highlight: Color lightBlue callback: [ 
        | tra |
        tra := RTSmoothLayoutTranslator new.
        tra nbCycles: 0.5.
        (v elements do: [ :e | tra translate: e to: ((500 atRandom @ 500 atRandom) - (250 @ 250)) ]) ].        
    v open
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