Redirect Nyquist Plot To Axes

I've created a GUI with an axes that I've named axsDisplay. I'd like this axes to display the nyquist plot created using the following code

num = [1 2 3];
den = [1 2 3 4];
gt = tf(num, den);
handles.current_data = gt;
handles.axsDisplay = nyquist(handles.current_data);

In my OpeningFnc callback I've added the following line of code to ensure that the handles data is redirected to the axes object

   axes(handles.axsDisplay)

I've also added a command button to the GUI that triggers the nyquist plot code when pressed. However this does not seem to be working as the axes is not updated with any data after I click the button. This is the output from the command window

>> clear
Warning: Log of zero.
> In log10 at 17
In @lti\private\roundfocus at 19
In lti.nyquist at 76
In MainApplication>cmdInitialise_Callback at 94
In gui_mainfcn at 75
In MainApplication at 44

What am I doing wrong here?