What I am trying to accomplish to to get financial data in my Flex Datagrid to be color-coded--green if it\'s positive; red if it\'s negative. This would be fairly straight
I like to override the set data function of the item renderer to change the renderer when the data provider changes as shown here
When you override the function you could cast the object to your object to make the availableFunding property available.
To access the text box you could try creating a public property and binding the property to the text box in the mxml file:
public var textVar:String;