The source code

    Ext.onReady(function(){
    	var win = window.nativeWindow;
    	var opener = Ext.air.NativeWindow.getRootHtmlWindow();

    	var d = new Date().clearTime(true);
    	d = d.add('mi', opener.Ext.state.Manager.get('defaultReminder'));

    	var time = new Ext.get('time');
    	time.dom.value = d.format('g:i A');

    	var ok = new Ext.Button({
    		text: 'OK',
    		minWidth: 80,
    		renderTo: 'btns',
    		handler: function(){
    			var t = Date.parseDate(time.getValue(), 'g:i A');
    			if(t){
    				var m = t.getMinutes() + (t.getHours()*60);
    				opener.Ext.state.Manager.set('defaultReminder', m);
    			}
    			win.close();
    		}
    	});

    	var close = new Ext.Button({
    		text: 'Cancel',
    		minWidth: 80,
    		renderTo: 'btns',
    		handler: function(){
    			win.close();
    		}
    	});

    	win.visible = true;
    	win.activate();
    });