Thank you! @stefan.hoehn
There was no dimmer or rollershutter to select as popup.
So I created a Layout page and added a Rollershutter cell.
Do I have to create a layout for every rollershutter or can I create one rollershutter card and then it will control the selected item at floodplan?
Same is for the dimmer. For every dimmer a dimmer card or can I create only one dimmer card and it will control the selected light?
Edit:
I was able a create a widget for dimmer via developer and this code:
Any idea where I can get a similar code for rollershutter control?