Diagram custom shapes

[fewfew]

I have different shapes which I drag from toolbox to diagram.

For example:

-Shape.name1 

-Shape.name2

-Shape.name3

What I want to do is on the diagram:

Move Shape1 to shape 2. So, Shape 1 bottom is connected to shape 2 top. (without connectors)

Shape 3 top should be only allowed to dock on shape 2 bottom.

All shapes have the same size.

Can anybody provide me some code examples for this?

[fewfew]

Attached a simple sketch