internalSetAllColumn: function(column, newValue) {
    column.masterValue = newValue;
    column.header = '<div class="x-grid3-check-col-td loading-indicator">&#160;</div>'; // loading icon
    this.grid.getView().updateHeaders();
    (function() {
        this.grid.getStore().each(function(rec) {
            if (this.isCellEditable(rec)) {
                rec.set(this.dataIndex, newValue);
            }
        }, this);
        column.renderHeaderCheck();
        this.grid.getView().updateHeaders();
    }).defer(50, this);
}

this.grid.getStore().each(function(rec) {
       rec.set.defer(1, rec, [this.dataIndex, newValue]);
    }, this);
    column.renderHeaderCheck();
    this.grid.getView().updateHeaders();

internalSetAllColumn: function(column, newValue) {
    var store = this.grid.getStore(),
        gridView = this.grid.getView();

    column.masterValue = newValue;

    store.suspendEvents();
    store.each(function(rec) {
        rec.set(this.dataIndex, newValue);
    }, this);
    store.resumeEvents();

    column.renderHeaderCheck();
    gridView.refresh();
}

var task = {
    run: function(){
        Ext.fly('clock').update(new Date().format('g:i:s A'));
    },
    interval: 1000 //1 second
}
Ext.TaskMgr.start(task);

internalSetAllColumn: function(column, newValue) {
    column.masterValue = newValue;
    column.header = '<div class="x-grid3-check-col-td loading-indicator">&#160;</div>'; // loading icon
    this.grid.getView().updateHeaders();
    var store = this.grid.getStore();
    var count = store.getCount();
    var step = 5;
    var times = (count / step) >> 0;
    var task = {
        run: function() {
            var last = step * task.taskRunCount;
            var first = last - step;
            if (first <= count) {
                var recs = store.getRange(first, last);
                Ext.each(recs, function(rec) {
                    rec.set(this.dataIndex, newValue);
                }, this);
            }
            if (task.taskRunCount > times) {
                column.renderHeaderCheck();
                this.grid.getView().updateHeaders();
                return false;
            }
        },
        interval: 1,
        scope: this
    };
    Ext.TaskMgr.start(task);
}