Looking for a WPF ComboBox with checkboxes...

Answer 1

You can do this yourself by setting the DataTemplate of the combo box. This article shows you how - for a listbox, but the principle is the same.

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Another article here is perhaps a better fit for what you are trying to do, simple set the first column of the item template to be a checkbox and bind it to a bool on your business object.

<ComboBox.ItemTemplate>
    <DataTemplate>
        <StackPanel Orientation="Horizontal">
            <CheckBox Checked="{Binding IsSelected}"
                       Width="20" />
            <TextBlock Text="{Binding DayOfWeek}"
                       Width="100" />
        </StackPanel>
    </DataTemplate>
</ComboBox.ItemTemplate>