Problems with scopesink

Hi everyone!
I am new to gnuradio (I’ m working with it for my thesis) and I have
problems with gr.sig_source_c + scopesink.
I would like to plot the generated complex source (real and imaginary
in scopesink2.scope_sink_f but it doesn’t work if I don’t add a second
(audio.sink) which I don’t really need.

src0 = gr.sig_source_c (sampling_freq, gr.GR_SIN_WAVE, frequency, ampl)
dst = audio.sink(sampling_freq)

class demo_graph(stdgui2.std_top_block):

def __init__(self, frame, panel, vbox, argv):
    stdgui2.std_top_block.__init__(self, frame, panel, vbox, argv)
    real = gr.complex_to_real()
    compl = gr.complex_to_imag()
    scope = scopesink2.scope_sink_f(panel,"Input -> USRP",

sampling_freq, num_inputs=2 )
self.connect(src0, real)
self.connect(src0, compl)
self.connect(real, (scope,0))
self.connect(compl, (scope,1))
self.connect(real, (dst,0))

This is the working code but if I comment the last line the scopesink
“freezed” and I can’ t even close it.
What’s wrong with my code?
Can I use scope_sink_c instead of scope_sink_f? How?

Thanks in advance

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