I found the way: first it has to be created a function in vb to make visible and invisible the trend

example:

// name of the realtime xy graphic : f(x) trend view_1

//name of the trend to be draw in the real time xy graphic: curve

Dim obj

///put any delay function here

objtrend.Visible=True

New question published by claude_reckinger is split to a separate thread with the subject Trend doesn't refresh.

Best regards
Jen_Moderator