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                this.choiceList_initialized = true;
            }

           this.choiceList.onCancel = this.options.onCancel;
           this.choiceList.onPing   = this.pingWrapper.bind(this);

           this.paginator.loadContent();

           this.grid_container.addClassName(bcss+'-widget');
           this.grid_container.store('widget', this);

           GvaScript.Grids.register(this);
        },

        getId: function() {
            return this.id;
        },

        clearResult: function(msg) {
            this.grid_container.update(msg || '');
        },

        clearToolbar: function() {
            this.toolbar_container.update('');
        },

        clearActionButtons: function() {
            this.actionsbar_container.update('');
        },

        clear: function(msg) {
            this.clearResult(msg);
            this.clearToolbar();
        },

        pingWrapper: function(event) {
            this.options.onPing(this.records[event.index]);
        },

        addActionButtons: function() {
            // first clear the actionbuttons container
            this.clearActionButtons();

            // append the action buttons
            var actions = this.options.actions.each(function(action_props, index) {
                // evaluation button condition in the 'this' context
                prop_condition = action_props.condition;
                switch(typeof prop_condition) {
                    case 'undefined' : action_props.condition = true; break;
                    case 'function'  : action_props.condition = prop_condition(this); break;
                    default          : action_props.condition = eval(prop_condition); break;
                }
                action_props.id = action_props.id || this.getId() + "_btn_" + index;

                // renders a <button> element and appends it to container
                new GvaScript.CustomButtons.Button(this.actionsbar_container, action_props);
            }, this);

            // activate the navigation over the action buttons
            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;
        }