WinForms: временно отключите обработчик событий

let parent
function removeItem (obj, itemToFind) {
	// Loop the object
  obj.find((e, index) => {
		// If the id's match remove from the parent if it exists otherwise from the object as its at root level
    if (e.id === itemToFind.id) {
      if (parent) {
        parent.children.splice(index, 1)
      } else {
        obj.splice(index, 1)
      }
			// break the loop once returned true. Change find to forEach to remove all instances with id if allowing multiples
      return true
    }
		// recurse
    else if (e.children && e.children.length > 0) {
      parent = e
      return removeItem(e.children, itemToFind)
    }
  })
}
// move item, return updated obj
function moveItem (itemToMove, obj, parentId) {
  for (let i = 0; i < obj.length; i++) {
    const value = obj[i]
    const item = search(obj[i], parentId)
    if (item) {
      item.children.push(itemToMove) // pushed into children, but need to move not duplicate in
      break
    }
  }

  function search (obj, id) {
    if (obj.id === id) {
      return obj
    }

    for (let i = 0; i < obj.children.length; i++) {
      const possibleResult = search(obj.children[i], id)
      if (possibleResult) {
        return possibleResult
      }
    }
  }

  return obj
};
removeItem(myObj, itemToMove)
moveItem(itemToMove, myObj, 3)