Drop a button
Copy it
Drop an anchor pane
Then:

1. Double click inside the anchor pane to get the orange ring
    Right click to get the context menu: No context menu appear, no paste action available! However the MenuBar > Edit > Paste is enabled (which is correct).

2. Select the anchor pane
    Right click to get the context menu: Paste is available, but it pastes the button as a sibling of the Anchor Pane (which is correct - but confusing for the user, since he sees no way to paste the button inside the anchor pane.

I think 1. must be fixed. There should be a context menu even if Paste is the only available action.
Regarding 2. maybe we should resurrect the 'Paste Into' action?