How to access the datagrid in one mxml in another component

Question

I have a datagrid in a.mxml. when click on the add button, it comes to a b.as file (not a class) to do some things and then, b.as call a popupwindow (c.mxml) to add a row into table (call backend). After I added the row to database table successfully, I want to add the row into datagrid to display, but I could not access the datagrid in a.mxml from c.mxml. How can I do this?
Thank you in advance.

Answer 1

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To add a row to the DataGrid you really need to just add data to the dataProvider collection object.
You can access components by going through the main app:
mx.core.Application.application.myA.myVar = myC.cVar;
But you should really be using custom events to communicate between components, though it is more complex. Here is my Flex 3 Cookbook post of the topic of custom events:
http://cookbooks.adobe.com/post_Building_a_wizard_using_a_simplified_MVC_architect-11246.h tml
Here are some sample apps on custom events on my web site (right click to View Source):
http://www.chikaradev.com/learning/flex3/customevents/CustomEventSimple/CustomEventSimple. html
http://www.chikaradev.com/learning/flex3/customevents/CustomEvents1/index.html
http://www.chikaradev.com/learning/flex3/customevents/CustomEvents2/CustomEvents2.html
http://www.chikaradev.com/learning/flex3/customevents/CustomEvents3/CustomEvents3.html
Here is my tutorial on custom events:
http://www.chikaradev.com/learning/flex3/customevents/StudentsTutoringCustomEvents1.pdf