Workflow help to select points within a polygon

using version GeoCortex 4.10.1

 

I have a workflow built that uses a Display Form Combo box to select and highlight a polygon.

 

I want to be able to go one step further and have that polygon select a separate layer (points) that fall within that polygon.  Can someone point me in the right direction (maybe a discussion or a published sample) that I could work from?  Still a newbie...

 

Christina