CustomSorter 
    open class CustomSorter(val gtkCustomSorterPointer: <Error class: unknown class><<Error class: unknown class>>) : Sorter(source)
GtkCustomSorter is a GtkSorter implementation that sorts via a callback function.
Constructors
Functions
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                  Notifies all users of the sorter that it has changed.
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                  Emits the "changed" signal. See onChanged.
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                  Gets the order that @self conforms to.
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                  fun onChanged(connectFlags: <Error class: unknown class> = ConnectFlags(0u), handler: (change: SorterChange) -> Unit): <Error class: unknown class>
Emitted whenever the sorter changed.
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                  Sets (or unsets) the function used for sorting items.