Requests and displays a popup menu for the specified list of objects.
@param objects a List of those objects for which the popup menu was requested.
@param invoker the Component on which the popup menu will be displayed.
@param x the x coordinate in invoker's coordinate space at which the popup menu is to be displayed.
@param y the y coordinate in invoker's coordinate space at which the popup menu is to be displayed.
Displays a popup menu in this TreeMapper. The popup menu will be centered horizontally in the MapArea, with a fixed vertical offset. This method should be used when triggering a popup menu programmatically, to ensure consistent placement.
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