Margin Border allows you to add a border/padding to a graphical node. Consider a .gmfgraph node like following:
Figure Descriptor XXXFigure Rectangle XXXFigure Flow Layout true ... Margin Border Insets 3 Child Access XXXNameFigure ...
This will add a transparent border of 3px around the sides of the image (generally). However, by default there seems to be a 0px border at the top of the image, 2px bottom, 1px left and 1px right, so in IAML I use an Inset of the following. This achieves a border effect similar to the one on the right.
Bottom = 3 Left = 2 Right = 5 Top = 3