static/ext/src/selection/CheckboxModel.js
function() {
        var me = this,
            showCheck = me.showHeaderCheckbox !== false;     

        return {
            isCheckerHd: showCheck,
            text : '&#160;',
            width: me.headerWidth,
            sortable: false,
            draggable: false,
            resizable: false,
            hideable: false,
            menuDisabled: true,
            dataIndex: '',
            cls: showCheck ? Ext.baseCSSPrefix + 'column-header-checkbox ' : '',
            renderer: Ext.Function.bind(me.renderer, me),
            editRenderer: me.editRenderer || me.renderEmpty,
            locked: me.hasLockedHeader()
        };
    }
function() {
        var me = this,
            showCheck = me.showHeaderCheckbox !== false;     

        return {
            isCheckerHd: showCheck,
            text : '&#160;',
            width: me.headerWidth,
            sortable: false,
            draggable: false,
            resizable: false,
            hideable: false,
            menuDisabled: true,
            dataIndex: '',
            cls: showCheck ? Ext.baseCSSPrefix + 'column-header-checkbox ' : '',
            renderer: Ext.Function.bind(me.renderer, me),
            editRenderer: me.editRenderer || me.renderEmpty,
            locked: me.hasLockedHeader()
        };
    }
Retrieve a configuration to be used in a HeaderContainer.
This should be used when injectCheckbox is set to false.