Redraw events capture

[gbulle]

hello,

I draw lines using Canvas over my chart.

Everything is working fine.

When I zoom the chart MT4 redraws the bars and immediately after clears and redraws the canvas.

I would like to clear the canvas before MT4 redraws the bars and draw the Canvas after MT4 redraws the bars.

How to capture REDRAW events ( before and after)?

TX