Hi MrProtonYo,
Interesting question. Looking at your picture, it seems a pretty expected feature but, when I search around, I don't really see both people using an specific 'title' to the legend itself nor asking for that feature. Started looking in Ext.NET and ExtJS discussions, then jumped to general searching for charts, and usually I don't see a title for the 'legends' box.
But you can achieve this in a couple manners, among them, just by setting a value to the Html
attribute on the LegendConfig
element.
Another way would be to use a <ext:TextSprite>
and position a label representing the legend's title right above it.
I hope this helps.