context:     deleteProperty: function(row)    {        if (hasClass(row, "watchRow"))            this.deleteWatch(row);        else        {            var object = getRowOwnerObject(row);            if (!object)                object = this.selection;                        if (object)            {                var name = getRowName(row);                try                {                    delete object[name];                }                catch (exc)                {                    return;                }                this.rebuild(true);                this.markChange();            }        }    },
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