Ext.grid.CheckboxSelectionModel=Ext.extend(Ext.grid.RowSelectionModel,{header:'<div class="x-grid3-hd-checker">&#160;</div>',width:20,sortable:false,menuDisabled:true,fixed:true,dataIndex:"",id:"checker",initEvents:function(){Ext.grid.CheckboxSelectionModel.superclass.initEvents.call(this);this.grid.on("render",function(){var a=this.grid.getView();a.mainBody.on("mousedown",this.onMouseDown,this);Ext.fly(a.innerHd).on("mousedown",this.onHdMouseDown,this)},this)},onMouseDown:function(c,b){if(c.button===0&&b.className=="x-grid3-row-checker"){c.stopEvent();var d=c.getTarget(".x-grid3-row");if(d){var a=d.rowIndex;if(this.isSelected(a)){this.deselectRow(a)}else{this.selectRow(a,true)}}}},onHdMouseDown:function(c,a){if(a.className=="x-grid3-hd-checker"){c.stopEvent();var b=Ext.fly(a.parentNode);var d=b.hasClass("x-grid3-hd-checker-on");if(d){b.removeClass("x-grid3-hd-checker-on");this.clearSelections()}else{b.addClass("x-grid3-hd-checker-on");this.selectAll()}}},renderer:function(b,c,a){return'<div class="x-grid3-row-checker">&#160;</div>'}});