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Tags

Tags allow grouping of arbitrary items.

Example
                  <
                  Element Id="Incubator1" Tags="MissionXItemsToClick;Machines" />
<Element Id="PCRMachine1" Tags="MissionXItemsToClick;Machines" />
<Element Id="Table1" Tags="MissionXItemsToClick" />
Binding by tag

Items with particular tag can be obtained using Binding.

Example
{Binding Tag=MissionXItemsToClick}

Once you have a collection of items, you can make queries using MultiBinding.

Example
{MultiBinding Source={Binding Tag=MissionXItemsToClick}, Expression=${Binding ClickCount, Converter=GreaterThan, ConverterParameter=0}, Aggregate=AllTrue}

Expression above checks if all items with tag MissionXItemsToClick were clicked at least once.