When using Qwt from SVN: what type of plot items are your questions about ?

The screenshots show regular curves ( QwtPlotCurve ) but your questions are about candlestick or bar charts ( QwtPlotTradingCurve/QwtPlotBarChart/QwtPlotMultiBarChart ). F.e. you are asking about how to hide horizontal gaps, what doesn't make much sense for the latter type of items.

Uwe