From OpenSCADAWiki
Using — runtime
Calling the dialogue is made by the "Select" item of the Graphics group element context menu. The dialogue provides the user to the possibility of selection the data source from the list, as well as an indication of its basic parameters: name, scale, logarithmic scale, dimension and the color of the trend, which you also can select typical/styled one by clearing. When you accept the dialogue the selected parameters are applied to the graphics group element chart, replacing the links. The "<Clear>" item selection and applying causes to clearing all the links and the graph's item. Into a text field under the list you can rapidly find any needed parameter.