Image AsyncMouseMove

[Michael]

Hello,

I would like to select an operating Point from a chart (TIWImage) with the mouse.
Like in the example "TChartDemo", but not via AsyncMousedown rather via AsyncMouseMove.
This works relatively well, but when I stop the Mouse on the Image, the Point jumps to another position.

I created an Memo to show the mouseway. Attached you will find a picture that hopefully shows what I mean.

What could be the reason for the jump at the end? And how can I prevent the jump?

Thanks,
Michael