Never mind, I found it, in C++ Builder it's Chart1->Series->CalcXPosValue(.....

Thanks

Bernard

Thanks for your response.

Where can I find the function 'CalcPosPixel' I have searched all of the directories under Steema TeeChart Pro VCL FMX 2017.22 but have not found it.

Bernard

Is there a way to obtain the Chart X and Y coordinates from a screen X, Y (mouse coordinates).

Thanks
Bernard