AdvancedDataGrid Tree Structure

AdvancedDataGrid Query:
1. As shown in the sample image i need to add multiple filter child nodes dynamically.
Here in this case ClusterBy,FilterComponent,AbstractQuestionSpecification,Operator.
2.For the added child nodes i need show delete button so that i can delete that added node dynamically

Refer the sample image.

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" creationComplete="init()">
	<mx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import mx.controls.Alert;
			import mx.controls.listClasses.IListItemRenderer; 
			
			private function init():void {
				//attributeType.setFocus();
			}
			[Bindable]
			private var student:ArrayCollection = new ArrayCollection(
			[
				{Course:"Filter", children: [
						{Course:"ClusterBy", children:[
								{Course:"AttributeType", Boys:120, TotalStudent:180, PASSinper:98.0, FAILinper:2.0}
							]
						},
						{Course:"FilterComponent", children:[
								{Course:"ClusterAggregateFunction", Boys:120, TotalStudent:180, PASSinper:98.0, FAILinper:2.0}
							]
						},
						{Course:"AbstractQuestionSpecification", children:[
								{Course:"AttributeType", Boys:80, TotalStudent:180, PASSinper:98.0, FAILinper:2.0},
								{Course:"NodeColourRegex",Boys:80, TotalStudent:120, PASSinper:95, FAILinper:5},
								{Course:"NavigationStrategyComponentAlias", Boys: 80, TotalStudent:90, PASSinper:97.5, FAILinper:2.5},
								{Course:"Context", children:[
										{Course:"QuestionTypeHandler", children:[
												{Course:"AttributeType",Boys:80, TotalStudent:180, PASSinper:98.0, FAILinper:2.0},
												{Course:"Value",Boys:80, TotalStudent:180, PASSinper:98.0, FAILinper:2.0}
											]
										}
									]
								},
							]
						},
						{Course:"Operator", children:[
								{Course:"FilterComponentOperatorType", Boys: 80, TotalStudent:90, PASSinper:97.5, FAILinper:2.5} 
							] 
						},
					]
				}
			]);
			private function save():void{
				Alert.show("Saved...");
			} 
			private function add():void {
				var item:Object = {};
				if(student.length == 1){
					var course:Object = student.getItemAt(0);
					if(course != null){
						var o:Object;
						o = findCourse(course.children[0], "AttributeType");
						if(o != null)
							item.attributeType = o.Value;							
						
						o = findCourse(course.children[1], "ClusterAggregateFunction");
						if(o != null)
							item.clusterAggregateFunction = o.Value;

						o = findCourse(course.children[2], "AttributeType");
						if(o != null)
							item.abstractAttributeType = o.Value;

						o = findCourse(course.children[2], "NodeColourRegex");
						if(o != null)
							item.nodeColourRegex = o.Value;
						
						o = findCourse(course.children[2], "NavigationStrategyComponentAlias");
						if(o != null)
							item.navigationStrategyComponentAlias = o.Value;
						
						o = findCourse(course.children[2], "Value");
						if(o != null)
							item.value = o.Value;
					}
				
				}
				dg.dataProvider.addItem(item);
				
			}
		
			private function findCourse(parent:Object, name:String):Object{
				for(var i:uint = 0; i < parent.children.length; i++){
					var child:Object = parent.children[i];
					if(child.Course == name){
						return child;
					}else if(child.hasOwnProperty("children")){
						return findCourse(child, name);
					}
				}
				return null;
			}
			
			
		]]>
	</mx:Script>
	<mx:Panel title="Include Filter" height="600" width="699">
		<mx:AdvancedDataGrid id="treeDg" sortExpertMode="true" displayItemsExpanded="true" height="363" x="13" y="13" width="669"
							 defaultLeafIcon="{null}"
							 folderOpenIcon="{null}"
							 folderClosedIcon="{null}">
			<mx:dataProvider>
				<mx:HierarchicalData source="{student}" />
			</mx:dataProvider>
			<mx:columns>
				<mx:AdvancedDataGridColumn dataField="Course" />
				<mx:AdvancedDataGridColumn dataField="Value"> 
					<mx:itemRenderer>
						<mx:Component>
							<mx:Canvas width="100%">
								<mx:Script>
									<![CDATA[
										override public function set data(value:Object):void{
											super.data = value;
											if(data != null)
												ti.text = data.Value;
										}
										
										private function setValue(event:Event):void{
											if(data != null)
												data.Value = event.target.text
										}
									]]>
								</mx:Script>
								<mx:TextInput id="ti" visible="{data.hasOwnProperty('Boys')}" width="98%" change="setValue(event)"/>
							</mx:Canvas>
						</mx:Component>
					</mx:itemRenderer>
				</mx:AdvancedDataGridColumn>
			</mx:columns>
		</mx:AdvancedDataGrid>
		<mx:HBox width="100%" horizontalAlign="right" paddingRight="10" paddingBottom="10">
			<mx:Button label="Add" click="add()"/>
		</mx:HBox>
		<mx:DataGrid id="dg" horizontalCenter="0" verticalCenter="0" dataProvider="[]">
			<mx:columns>
				<mx:DataGridColumn dataField="attributeType"/> 
				<mx:DataGridColumn dataField="clusterAggregateFunction" width="150" /> 
				<mx:DataGridColumn dataField="abstractAttributeType"/>
				<mx:DataGridColumn dataField="nodeColourRegex"/>
				<mx:DataGridColumn dataField="navigationStrategyComponentAlias"/> 
				<mx:DataGridColumn dataField="value"/>
				
			</mx:columns>
		</mx:DataGrid>
		<mx:ControlBar>
			<mx:Spacer width="80%"/>
			<mx:Button paddingRight="20" label="Save" click="save()"/>
		</mx:ControlBar>
	</mx:Panel>
</mx:Application>

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Filter.bmp