MATLAB's maximum name length in GUI doesn't allow gui to update even after writing drawnow.

I have made a GUI named test_gui in which I have a push button named testoutput to plot a figure when I push this button I get this Warning and my GUI doesn't updates the figure every time in a loop even after writing drawnow. The only warning I get is this and the program ends.

Warning: 'hobject_eventdata_test_gui__testoutput_callback__hobject_eventdata_guidata_hobject'
  exceeds MATLAB's maximum name length of 63 characters and has been truncated to
'hobject_eventdata_test_gui__testoutput_callback__hobject_eventd'. 
> In fileio\private\issubfield at 49
  In fileio\private\warning_once>fieldnameFromStack at 194
  In fileio\private\warning_once at 123
  In ft_read_header at 1168
  In read_buffer at 31
  In Test_GUI>TestOutput_Callback at 172
  In gui_mainfcn at 95
  In Test_GUI at 42
  In @(hObject,eventdata)Test_GUI('TestOutput_Callback',hObject,eventdata,guidata(hObject))

[Adam]

Name your function something shorter. I don't see in your code where a function with that name is occurring but it seems a rather absurd function name anyway!