How to prevent multiple nodes at same location?

@kenai wrote:

Thank you so much dear Simon. I understood that problem.
But now I have one more problem can you solve it?

I'm using grid layout https://gojs.net/latest/intro/grids.html.
Problem is duplicated nodes in grid layout. So I want to block duplicated nodes in grid layout.
Each grid cell has allow only one node.

Figure1.(drag to right)

Figure2. (after dragging)

This case I cannot find Alpha node. It's big problem of my layout.
Please help me? Thank you.

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