to create a chart based on a listing, the following conditions must be fulfilled:
It must have at least 2 columns
Each listing cell content must begin with an expression
put cursor inside listing
choose from popup menu Change Into Chart
Listing will be changed into chart according to the following rules:
it will be a bar chart
data on the chart will be labeled with expression from the first column
following chart series will correspond to following column expressions starting from the second one
the chart title is the text from the first column header in a listing
series names come from the following column headers
label color will suite the font color in particular columns
series color will suite the font color in particular columns
data sorting and filtering will be kept in the listing
other information is going to be lost