Now we'll add some buttons to the stack we have going. One thing to know: the layout features in MobGUI (that we will look at next) are in competition with the Geometry Manager, so if you still have that open from earlier, click on the check box that says "Disable auto geometry.
Take the first four buttons and duplicate them, to give another set of four below the first ones.
Select the first of the new buttons and in the Geometry section of the Inspector palette click once on the vertical bar, and twice on the horizontal bar, ending with the state shown in the screenshot.
Do the same for the other three buttons.
Try resizing the card window.