Define the parent, when you create a graphical object:
FigH = figure;
AxesH = axes('NextPlot', 'add', 'Parent', FigH);
plot(1:10, rand(1:10), 'Color'Parent', AxesH);
DialogBoxH = figure;
DialogAxesH = axes('Parent', DialogBoxH);
text(0.5, 0.5, 'Message', 'Parent', DialogAxesH);
plot(1:10, rand(1:10), 'Parent', AxesH);
This is some additional time during writing, but then it is "thread-safe": Note that e.g. a GUI or TIMER callback can create a new axes object. When you then call e.g. plot, the wrong axes is used. So relying on the current obejct to be the expected one is lazy. Do this is tiny test scripts only, if a messed up output it does not matter. For serios code, the 'Parent' is obligatory.
