I build up a GUI with guide. This GUI holds an axis containing some lines. Now I want to change this lines within a timer function (deleting all objects to the axis - cla(axes_handle) and rebuild all lines). Deleting works fine. Using the line command opens always a new window, because gca and gcf seam to be not valid.
I tried to set the current axis with axes(axes_handle). Also including the command figure(fig_handle) does not work.