I would like to create graphs with gradient drawtype. This is not (yet?) possible through the web interface, so I used the webinterface to create the basic graph prototype and used the API to change the drawtype.

The setup is as follows:

Template -> Discovery Rule -> Graph prototype -> Graph items

The graph items got a drawtype of 0 (line), and I used the API to change it to 5 (gradient line). The change was succesful, if I use the API to check, it does say drawtype 5 now.

Now this discovery rule had already detected a lot of items and thus an equal amount of graphs already exist. They should have been changed accordingly, but this was not the case.
I tried using the API to update those graphs but this gives an error, explaining that you cannot change dynamically created graphs individually, you have to change the graph prototype instead.