Custom tooltips in Line Chart Visuals Legend Issue

hello lkaneff 

perhaps the mismatch result comes from not accurate measure?

here is a simple example of my dummy data.

When i create a measure for getting the value of ID, it will get wrong result.

to achive the right result, i made a column index, then i refered a measure to that index.

the important is you can not create a measure to get a value that is not a number so you need to repointing a number into that string value.

i am not sure if i explained correctly but hope you get the idea.

Hope this will help.
Thank you.

hello lkaneff 

that is depend on how your data is.

i did with indexing the column based on value for all data/rows. after indexing, i calculate which index has the max value on each date. then i calculate what country based on the return index.

but surely you can do with if statement to do this. in my experience, you can not rely on DAX to return a string value directly so you need a unique value for what you want to get then return that value into the string value.

take a note as mentioned by danextian , by default line chart will calculate across all lines.

Hope you get the idea.

Thank you.