If a popup closes automatically, i.e. when it has lost focus, anywhere on the page except itself is clicked/focused, or after a time passes, are the buttons that function as closing the popup redundant?

Compare the examples on the left with right in the below scheme.

  In the first example, popup appears as the header of the combobox is clicked and it disappears when the combobox is clicked again or anywhere on the page except the popup is clicked.

  In the second example, popup appears as any point on the map is clicked and it disappears when any other point on the map is clicked.

^{download bmml source – Wireframes created with Balsamiq Mockups}

There could also be a context menu example but I myself don't prefer to use close buttons on a context menu that appears on right click. If there is also a different UX standart about that, I ask you to state it as well.

Take a popup that closes automatically, either by losing focus, by other elements being brought into focus or clicked, or upon expiration of a set display time. Is providing a redundant close button on this popup necessary?

Compare the two examples shown side by side in the mockup below. In the first example, the popup appears when the combo box header is clicked and disappears when the combo box is clicked again or any other element on the page except for the popup is clicked. In the second example, the popup appears when a point on the map is clicked and disappears when another point on the map is clicked.

^{download bmml source – Wireframes created with Balsamiq Mockups}

I can also provide an example where a right click opens a context menu containing the close button. But I prefer not to place a close button in a context menu. If there is also a different UX standard about this I would like to know about it.