Limiting MIGX datasets in the Manager

	,addItem: function(btn,e) {
	    var maxRecords =  parseInt('{/literal}{$customconfigs.maxRecords}{literal}');
        var s=this.getStore();
        if(maxRecords != 0 && s.getCount() >= maxRecords){
            alert ('[[%migx.max_records_alert]]');
            return;            
        }
		this.loadWin(btn,e,s.getCount(),'a');
	}

[

{"caption":"Menu Item 1", "fields":[
    {"field":"text1","caption":"Menu Item 1"}
]},

{"caption":"Menu Item 2", "fields":[
    {"field":"text2","caption":"Menu Item 2"}
]}

]

[

[

{"header": "Menu Item 1", "width": "160", "sortable": "true", "dataIndex": "text1"},

{"header": "Menu Item 2", "width": "160", "sortable": "true", "dataIndex": "text2"}

]

]