How to specify the sequence of the shapes in the diagram

[Coal8Support]

Hi,

Just wondering if there is a way to specify the sequence of the shapes in the diagram when I add shapes to the diagram via datasource and connectionSource.

the example 1 is

http://dojo.telerik.com/aQUPE

I am trying to get the s1 above the s2 and s2 above s3, but the result is s3 above s2 and s2 above s1.

 

the example 2 is 

http://dojo.telerik.com/EfUPu

I am still trying to add s1 above s2 and s2 above s3. In the next level , I am trying to have s4 above s5

Please could  you let me how specify the order of the space in the diagram if it can be done? I am using layout - layered and right.

If not, could you let me know the logic of setting up the shapes' positions behide the diagram