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Multi-select combo box with check marks #3802

@Luk164

Description

@Luk164

Is your feature request related to a problem? Please describe.
I currently used an open source fork of extended wpf toolkit because of their CheckComboBox component. Is there any way to replace it with something from MahApps?

Describe the solution you'd like
A simple and reliable way to replace this:

<xctk:CheckComboBox
ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Page}}, Mode=OneWay, UpdateSourceTrigger=PropertyChanged, Path=DataContext.Tags}"
      d:DataContext="{d:DesignInstance entities:EventEntity}"
      DisplayMemberPath="Name"
      ItemSelectionChanged="Selector_OnItemSelectionChanged"
      SelectedItemsOverride="{Binding SelectedTags, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
      Foreground="{DynamicResource MahApps.Brushes.Text}" />

Additional context
This is a member of a custom datagrid column. I need it to be able to bind and immidiately update all items that are selected with checkmarks. (this is used in edit item scenario where list sends edited object to editor and page just binds everything to this object, so any items that were previously selected have to be updated)

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