Trend line visibility control

Hello,

I have trend object and I need to control trend line visibility using buttons (not using the Trend object icons).

For example, I have trend with three values (lines) displayed. If I want to remove one line (to hide it) I have to click on Trend object icon with this function. How can I do the same using Button object, in this case three buttons (1 for each line)?

Or, how can I know which line is hidden? Can I access it somehow using vbs? Because depending on which line is hidden I have to do something else.

Thanks in advance

Hello,

I'm using WinCC RT Professional