[Paraview] how do filter presses apply button? pv xprt plz hlp!

[Bam Ting]

My filter don need to have the user press apply button. It display some
value, there are nothing user can change, display only. can filter press
apply by hiself? I want when new filter is create that my user no need to
worry about apply buton. how? THX - BAMPING
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