Show spinning wheel icon while plugin is executing

Hi,

 

I'm processing a lot of artifacts by walking our extensive TeamCity project structure with this plugin that sometimes can churn for a long time. I thought it'd be nice to give user some kind of spinning wheel control to indicate that the program is running in the background. Is there something that TeamCity provides that I  could readily tap into, like the typical green spinner used in many places.

 

Thank you!

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