I'm trying to create a multiselect listbox filter control. I was using Josh Heyes filters but I'm upgrading to 4.0 and this is no longer compatible. I have created a new UserControl which inherits from QueryableFilterUserControl, but I can't work out what I need to put into the GetQueryable method. It's very similar to the ForeignKey filter, it's just that I want the user to be able to select multiple items in the list.
Can anyone help?
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