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Normally, RainPro can generate the key automatically from the chart you have plotted, for example if you plot a bar chart and a line graph the key will be preset to a small shaded block and a line (and/or marker) of the appropriate type and colour. If for some reason you want to hand craft a key you can use this property to set the type of placeholder:
ch.Set 'Ktype' 'Bar' ch.Set 'Ktype' 'Line,marker'
This will pick up the current settings of the colour, marker and pattern cycle to get a key in a particular colour sequence you must include a Colours setting just before you write the key.
See also ...
ch.WriteKey output key at given location
Colours set colour cycle