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Datachart GetPonts from Crosshair


i have a datachart with x-y Data, a legend etc..
Now I want to get an x,y-value according to the datachart, if i click somewhere in the x-y-range.

Using 'PointToClient' and 'PointToScreen'  I have the problem, not to know the real size of the chart - without the axis- and legend areas.

Any help appreciated