@Override
			public Point getPopupPoint() {
				if (vertex.isFullScreenMode()) {
					return super.getPopupPoint();
				}

				Point buttonUpperLeftCorner =
					controller.getViewerPointFromVertexPoint(vertex, new Point(0, 0));
				Point buttonBottomLeftCorner =
					controller.getViewerPointFromVertexPoint(vertex, new Point(0, getHeight()));
				int y = buttonBottomLeftCorner.y - buttonUpperLeftCorner.y;
				return new Point(0, y);
			}
This is used by our button above to show a popup.  We need to override the
value here, since
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/vertex/SetVertexMostRecentColorAction.java