how to add a rectangle onto a ext.chart.Chart

[tianhao]

hi all,
i create a simple chart like ...
Ext.create('Ext.chart.Chart', { ...,store:...,axes:... });
...it works without error.
then i want to add rectangles onto the chart, according to their position and size data. how can i get there?
thanks.

[scottmartin]

Can you provide more detail?

What type of chart?
Do you want the points to be square, or perhaps like in a scatter plot?

Scott.