Flex Data Filtering

hello everybody,

 im learning flex and i was wondering if it is possible to filter data coming 
in xml format to display specific results only.

 what im doing:
 im connecting to a webservice which returns xml data that i display in a 
datagrid using databinding (this works fine).

 what im trying to do:
 display only certain rows from the data recieved.. for example let say im 
getting car information.. i wanna display the only the cars made by a certain 
manufacturer that i specify in another xml or through a text box.

I generally do not try to implement something like filtering within the 
component. I have external functions that I use for this. These function build 
a subset of the data (based on my criteria); I then assign this new dat set as 
the data provider for the grid. You can dynamically assign and re-assign your 
dataProvider in action script as often as you'd like.