Closed Issue: CheckedComboBox needs MaxDropDownHeight Property [18067]

If many items are insert the DropDown extend its high unlimited.
 
Workaround:
 
<xctk:CheckComboBox.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel IsItemsHost="True" CanVerticallyScroll="True" MaxHeight="200" />
</ItemsPanelTemplate>
</xctk:CheckComboBox.ItemsPanel>