In a databand, I want now to filter for those selected elements. So I go under "Filter" and insert following expression:
Requirements.Code == ListBoxControl1.SelectedItem
Now this gives me only the first selected item of the listbox, but I want that all the selected Items.
So what I need is something that gives me in the filter expression, all the selected items of the listbox.
Many thanks!
Edit: Here some screenshots to better understand.
The listbox to select my items:

The filter function of the databand (where I would like to have all selected, and not just the first):
