gistfile1.txt

Joose.Class('Class1', {
  use : [ 'Class2' ],
  has : {
    myAttr : {
      is : 'rw',
      lazy : function () { return new Class2({ passed : this.getPassThis() }) }
    },
    passThis : {
      is : 'rw',
      init : null
    }
  },
  methods : {
   initialize : function () {
     this.getMyAttr()
   }
  }
})

Joose.Class('Class2', {
  has : {
    passed : {
      is : 'rw',
      init : null
    }
  }
})

var myInstance = new Class1({ passThis : 'someValue' })