Data provider selection

Evening
I'm attempting to create a data provider selection drop down box. The box should allow selection of one of many external XML documents, which when selected, fills in the datagrid below.
So far I've got the XML documents set up, and have been able to link them with the main project
I've got the datagrid working nicely with both sizes and behaviours, and displaying data properly
I've got a drop down working (heheh)
It's the part where the drop down displays the list of XML docs and allows me to select them as the datagrid data provider that has me stumped.
I wonder if anyone would be kind enough to point me in the direction of a tutorial, or example code that would allow me to do this. I've had a browse, but can't think of any other terms to use besides the obvious (XML, data provider, data provider selector, data provider selection etc).
I'm also wondering if what I'm attempting is maybe more complicated than I think, which may be why I haven't stumbled upon anything specific yet.
All the best,
Mag
P.S. I am new also, which I think may be obvious by the question Flex looks too useful to pass up learning, so it's time to take the plunge I think.

Morning. Sorry. It seems I said a lot but didn't explain very well. My fault
Thank you both for your replies. I think I should have explained from the point of view of the app actually running.
So imagine you run the app in your browser, and you see one datagrid, and one drop down box. Inside the drop down is a choice of XML files. Selecting XML file 1, will display the XML1's info in the datagrid. Selecting XML2 will display XML2's info in the datagrid and so on.
It's creating that drop down that allows me to select XML files for the datagrid to use while the app is running that is my stumbling block.
I'm familiar with the XML structure and how to display the info correctly inside the datagrid if the XML file is static.
I am however unsure how to go about being able to select an alternative XML file for the grid to use while the app is running - this is what I'd like to find out how to learn.
All the best,
Mag

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<?xml version="1.0" encoding="utf-8"?>
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 <node label="Fourteen" />
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Message was edited by:
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Edit 'Page1' of the project.
1. Create an Entity class, simple class that has only getters and setters with a few fields (lets say 'id' and 'name').
2. In the SessionBean1 that is generated by the framework create an array of Entity class named 'entityArr', and getters and setters for this field.
3. Add a new Array Object Data Provider on the page and set in its properties as array the array created in the previous step 'entityArr (SessionBean1)'.
4. Add a new table component, and set as data provider the provider created in step 3.
In the Table's Layout map the fields from the Entity class, and set whatever compnents you desire for each component's type or leave the default ones (Static Text).
5. Add a 'property change trigger component' on the page. I called it like this because I tried the following :
5.1 A text field and a button to submit the text value
5.2 A Calendar component with autosubmit
5.3 A DropDown with autosubmit.
6. On the property change trigger component created at step 5 set a value_changed method that changes the the array that should be displayed by the table.
For Example, for a DropDown component, you will have a method like this :
public void dropDown1_processValueChange(ValueChangeEvent event) {
String idStr = (String) event.getNewValue();
System.out.println("Entity id :"+idStr);
if(idStr .equals("item1")) {
fillSessionBean1(true);
else {
fillSessionBean1(false);
getSessionBean1().setItemName(idStr);
private void fillSessionBean1(boolean fillValues) {
Entity[] values ;
if(fillValues) {
values = new Entity[4];
for ( int i=0;i<values.length; i++) {
Entity entity = new Entity();
entity.setDescription("Description "+i);
entity.setName("Name "+i);
entity.setId(i) ;
values[i] = entity;
else {
//values = new Entity[0];
values = null;
getSessionBean1().setEntityArr(values);
7. When running the program, if the selected is Item1, the table does not show the array set if on this branch.
I am using :
Netbeans 5.5 build 20061017100,
Visual Web Pack 070104_2,
Ent.Pack 20061212
jdk 1.6.0
Operating Systems : Both Linux Suse10 and Windows.
If anyone has a solution for this please let me know.

OK
While no one responded, I had to think for myself.
There is a bug in the code generated by netbeans or there is nowhere specified that if you attach an array to a data provider you will have to notify by hand the data provider that the array has changed.
You will have to put this line that is generated in init function in your valuechanged functions :
objectArrayDataProvider1.setArray((java.lang.Object[])getValue("#{SessionBean1.entityArr}"));
I think this aproach is a little bit wrong, even it works.
I believe the data provider should be notified the array has been changed.
There could be a much more simple aproaches :
1. In the code generated by netbeans, if you attach an array to a data provider the data provider will be notified after any set(Object[])
2. The data provider could have a function so you will ne anle to attach to the data provider an Object (the session bean, in my case) and the name of the function that retrieves the array (in my case, 'getEntityArr') .
The code generated by netbeans could add this function easily.
Maybe there are any other better aproaches, and I might be wrong.
It's good that it works.

Data provider selection

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