As noted in the documentation, MATLAB's brush does not work with errorbar plots (see section Plot Types You Cannot Brush). For example,
figure;
errorbar((1:10)+2*sin(.3:.3:3),cos(1:1:10)/2);
hold all;
plot(10:-1:1,'o-g');
brush
generates a plot where I can brush data points from the green plot, but not from the red errorbar plot:

Update
Ideally I would like to find a way to retroactively make plots with error bars brushable, short of extracting XData and YData and recreating a graph with plot.
Failing that, is there a function to replace errorbar which allows this for plots I create in the future?
errorbarthat useslineinstead ofplotto add errorbars. Contact me via the link in my profile if you want it. - Jonas