Flex application layers

I'm new to Flex and I want to separate app tiers/components as much as possible.

So I have three mxmls:

1. X.mxml which has a datagrid with students
2. Y.mxml which must be able to tell which student is selected in the X.mxml's datagrid (row id ?)
3. XY.mxml which uses th开发者_如何转开发e previous 2

Which is the best practice here ?

Thanks.

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For this I use an MVC framework, specifically Robotlegs. Robotlegs is simple to use and allows you to create mediators for your components. Here is a video I recorded going through some simple steps for wiring an application.

That said, your components can communication via XY. Y will have a public property called selectedStudent which can be bound to the selectedItem property of X:

<Y selectedStudent="{X.dataGrid.selectedItem}"/>

So, when the selected item is updated, it updates the selected student property.