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            this.actionButtons = new GvaScript.CustomButtons.ButtonNavigation(this.actionsbar_container, {
                selectFirstBtn: false,
                className: bcss+'-btn-container'
            });
        },

        // wrapping the recordset in a table with column headers
        gridWrapper: function(html) {
           return '<table class="'+bcss+'-grid '+this.options.css+'">' +
                    '<thead><tr>' +
                        '<th class="grid-marker">&nbsp;</th>' +
                        (this.columns.collect(function(e) {
                            if(_evalCondition(e, this))
                            return '<th class="grid-header'+_compileCss(e)+'"'+_compileWidth(e)+_compileTitle(e)+'>'+e.label+'</th>'
                            else return '';
                        }, this).join('')) +
                    '</tr></thead>' +
                    '<tbody>'+html+'</tbody>'+
                '</table>';
        },

        // called by the paginator
        receiveRequest: function(response_json) {
            this.records = response_json.liste;
            this.total   = response_json.total;
            this.rights  = response_json.rights || {can_create: 1};

            var list_records = $A(this.records).collect(function(e, index) {
                        return  '<td class="grid-marker">&nbsp;</td>' +
                                this.columns.collect(function(c) {
                                    if(_evalCondition(c, this))
                                    return  '<td class="grid-cell index_'+(index%2)+_compileCss(c)+'" valign="top">' +
                                            _getColumnValue(c, e) +
                                            '</td>';
                                    else return '';
                                }, this).join('');
            }, this);

            // TODO not elegant !
            if(this.choiceList_initialized) {
                this.choiceList.updateContainer(this.grid_container, list_records);
            }
            else {
                this.choiceList.choices = list_records;
                this.choiceList.fillContainer(this.grid_container);
                this.choiceList_initialized = true;
            }

            if(this.options.grabfocus) {
                try {this.grid_container.focus();}
                catch(e) {}
            }

            if(typeof this.actionButtons == 'undefined')
                this.addActionButtons();

            if(!(this.total > 0)) this.options.onEmpty.apply(this);

            (this.options.onShow || Prototype.emptyFunction).call();

            return this.records.length;
        }
    }
}());

// registers all grids
GvaScript.Grids = {
    grids: $A(),

    register: function(grid) {
        this.unregister(grid);
        this.grids.push(grid);
    },

    unregister: function(grid) {
        // nothing to unregister
        if(!grid) return;

        if(typeof grid == 'string') grid = this.get(grid);

        // nothing to unregister
        if(!grid) return false;

        // remove the reference from array
        this.grids = this.grids.reject(function(g) { return g.getId() == grid.getId() });

        return true;
    },

    get: function(id) {
        return this.grids.find(function(g) {return g.getId() == id});
    }
}