JS functions to open dialog for creating/deleting items and relationships

Hi all,

I am aware of the JS function "top.ui.ShowItem(itemTypeName, itemID, viewMode)" which open an item based on its type and Id in a new window.

But I didn't find an equivalent JS function to 1) create an item 2) delete an item 3) pick a related item 4) remove an existing relationship.

Did I miss something?

Jeroen