Need help in using Axapta Collections Class

Hi,

I have some problems in using Axapta Collections class, i need to combine container and list.

Example in python code:

testDict = {} // declare dictionary

testList = [] // declare list

testDict = {'size':[1,2,3,4,5]} // Assign value

When calling the dictionary:

testDict['size'][0] // it will shows out result 1

How to simulate similar way in Axapta?

thank you very much