If the figure object that you wish to move to the top (or bottom) of the figure has a common property, you could use the uistack function to set that object's property. E.g., if you want to move the red dots to the bottom of your biplot, you could do this:
redMarker = findobj(gcf,'Color', [1,0,0]);
uistack(redMarker,'bottom');
Similarly, you could grab hold of any object and move it anywhere using 'uistack'.
