Yesterday I have tested several times with the same code RTD_V_1.20.au3 that you have uploaded every thing works fine, but today I am running the same code but giving error cant figure-out what problem it is!
when click delete Tics its giving error (RTD_V_1.20.au3" (1230) : ==> Subscript used on non-accessible variable.)
After took out $Npi condition in _On_DeleteTics_Click it works fine, cant figure out why it is reading line 1231 $TempSymbol = $NdxScrips[$i][0], if its a $Npy or $Npn
Tried If Not $Npy or $Npn no luck.
give us a solution please.