plotmatrix + scrollzoomer/picker problem

Hi,

I have a trouble with QwtPlotPicker.
I have many QwtPlots in GridLayout positioned vertically (x Axis - time) (it is based on plotmatrix example) and I try to apply scrollzoomer/qwtplotpicker (from realtime example - scrollbar, scrollzoomer).
I would like to have opportunity to select the xAxis on one plot and to have vertical line (marker) on all of the rest of plots (also including spaces between them - gridlayout spaces)
Any Hints? Where should i start?

Regards,
DizL