reset colors for barchart

Enabled color themes again

removed old resize method from barchart

minor.typo

Adds titles to all linechart examples

Adds title support

Add gradient bacground support * support for vertical horizonstal gradieent * user defined colorts * minor. fix axis geomoetry

Refactora axis and line chart to use graphics items insted of painter.

git acrobatics

drawing fix for bar chart