question

Here's one approach:

TestDasbhoardExport.fsm

You can't draw an invisible dashboard. But you can open the dashboard via code. In the past, this was not enough because the charts aren't immediately ready. Now, however, you can use coroutines to solve this issue:

var dashboards = Model.find("Tools/Dashboards").subnodes;
for (int i = 1; i <= dashboards.length; i++) {
    treenode view = applicationcommand("dashboard", dashboards[i]);
    
    // wait for the chart to load
    // For example, 2 seconds works for me
    await Delay.realTime(2);
    
    viewtofile(view, modeldir() + dashboards[i].name + ".png");
}

Using the await keyword, you can open the view, then wait for the view to open, then use viewtofile().