Flash Form talking to cold fusion

[Robert-Flash]

I am using CFGRID to display the results of a SQL query.
I want to allow the user to select items from the list results and add the
choices to a session variable array.

<cfgrid name="AudioInfo"
colheaders="yes"
query="getAudioList"
selectmode="row"
height="300" >

The variable is SESSION.SongList, when I select a rew from the list by
clicking on it, I want to add the variable #Song_No# to the Array
SESSION.SongList[x][2] .

Any suggestions?