What is tip for [not affected by other button] at Example 11?

[leegod]

At ngui official Example 11-Drag & Drop,

Left, right side's item can be draged and dropped to [above] other side's item.

How this can be?

I made similar scheme with this at my scene, but when I move item from one grid(A) to other grid(B),

if I drag and drop on [top of] B's already existing item, then item go back to original position.

How can I avoid this?

[ArenMook]

UIGrid set to vertical sorting.

[leegod]

UIGrid set to vertical sorting.

Thx for reply.
But already set to vertical sorting.

I think problem is, B's item's collider blocking newly dragged over A's matching with B's scrollview's rect.

I have same depth between A, B's items like NGUI exampl11, but how NGUI example11's mechanic can do it?

[leegod]

This solved.

I created ngui-create-widget, and make it upmost parent 1 generation below of UIRoot, and make all left or right scrollview objects as child of it, then it works when move [on top of] other side's item also.