Timing in Mixed Graph Signal

Hi,

I would like to graph digital and analog signals on Mixed Graph Signal. I have an option to see portion of these waveforms ( for example start at second one and plot 2 seconds of data). The problem I have is I need to check Autoscale ( X scale ) to see my waveforms but if I do this the X scale starts from bogus numbers. And if I programatically change Start , min and max of the X scale of the mixed graph then I can't see ,my signals .

Could you pleae let me know how can I fix thois timing issue.

Thanks