How I can get an varible object?

I have problems to get an object because its properties all the time are changing for this reason the TypeInto activities write the text in another control. I don’t know what I must do to specify each control. I tried to use the selector but It only gets an useless properties.
Also, I tried to use a variable in the string selector but It is not possible ( I don’t know why)

This is the string that the selector gets

As you see, this information is not useful because the idx is variable and it can get any value.

I hope someone help me and the programmers improve the elements recognition

To understand better, can you share your code?