Hi Jason,
just to be sure to understand what you need:
Do you mean "zoom in x-axis"?
(because technically, the bandwidth of that display is always Nyquist,
i.e. defined by the sampling rate)

Best regards,
Marcus

On Mon, 2018-07-30 at 16:57 -0400, Jason Hein wrote:
> I have a GNU radio flow graph with a custom data source and I'd like to be 
> able to change the bandwidth displayed on the QT GUI Frequency Sink block 
> dynamically.  Is there a way to do this programmatically?  The QT GUI 
> Frequency Sink block has a message port for programmatic changes to 
> frequency, but I don't see an equivalent means for changing bandwidth.  Is 
> there a way for an OOT block to get a reference to another block to call a 
> public member function?

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