ItemsControl with a MoreItems Popup

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I have ItemsControlwhich is filled with "ContextActions", if the ItemsControl does not fit into the parent Container I want to show a "More Items" button (the typical three dots) and put another ItemsControl into a popup that appears when the button is pressed.

I tried creating a Template that does Show a Button if the ItemsControl is full, sadly I did not find a Property to bind on if the ItemsControl is full.

<Style TargetType="ItemsControl">
   <Setter Property="Template">
      <Setter.Value>
         <ControlTemplate>
            <DockPanel>
               <Button Content="More" DockPanel.Dock="Right" />
               <ItemsPresenter />
            </DockPanel>
         </ControlTemplate>
      </Setter.Value>
   </Setter>
</Style>

Is there any way to find out if the ItemsControl is full using a Property or do i have to write my own MeasureOverride to implement the "MoreItems" Button

asked 1 min ago

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ItemsControl with a MoreItems Popup