Attached you find angels project.
I added the xChart.bas module instead of using the xChart.b4xlib library.
I added Log(Action) at the beginning of the xpnlCursor_Touch routine to see what happens.
When moving with the finger you see at the beginning 0 DOWN and several 2 MOVE and a 3, i do not know what this is and no further action is transmitted, the UP action is not transmitted.
If you touch without moving you get the 0 DOWN some 2 MOVE and the 1 UP, which is normal.
Then, when moving with the finger, the chart view moves also, i do not know how Android handles this.