Ext4.2 grid 删除后去掉全选

selModel.deselectAll();

gridOrganization.getSelectionModel().deselectAll();

参考：

http://zhidao.baidu.com/link?url=A5G-oUrr0qR020TXtHjydUvnf2ynu0cZMJ_UzNwMM7-SBQOwwsBIiqkPItiYXFZvdgOqn1be4C_NkcLB07NRq_