Weird bug with TRegionTool.DrawBehindSeries

[jens.mertelmeyer]

• IDE: RAD Studio 10.1 Berlin (24.0.22858.6822)
• TeeChart: 2016.18.160504 32Bit FMX

This took me quite a while to figure out: When the TRegionTool of a TeeChart becomes active and has "DrawBehindSeries = True", then other parts of my form randomly become missing. They're not drawn at all. When they change (for example hovering above it with the mouse), some of them might become visible.

I have attached a sample video, please let me know if you need a sample project.

[Yeray]

Hello,

I've reproduced the problem so I've added it to the public tracker:
http://bugs.teechart.net/show_bug.cgi?id=1631

[jens.mertelmeyer]

Many thanks.