this.buildKey(CSSName.BORDER_SHORTHAND);
this._topColor = border.topColor(); this._rightColor = border.rightColor(); this._bottomColor = border.bottomColor(); this._leftColor = border.leftColor();  this._key = border._key;
    public BorderPropertySet(            float top,            float right,            float bottom,            float left    ) {        this._top = top;        this._right = right;        this._bottom = bottom;        this._left = left;        this.buildKey(CSSName.BORDER_SHORTHAND);    }