how to made plugin using flex3 application

Hi   All,

I am working on transitiom plug-in for  premiere pro cs3 ,using  premiere pro cs3 SDK.

now i am developing plugins by using adobe flex3 ,application name is transition viewer

in which when click on thumbnail play the transition on  the text of preview window.this transition

effect is xml file.

    so,How to popup the above flex application when click on  the folder in premier pro cs3,using  premiere pro cs3 SDK.

please help me

Thanks