Hi everyone,

I'm developing a SolidWorks add-in using VB.NET for SolidWorks 2022. The add-in adds a custom command to the toolbar, and when the user clicks it, a PropertyManagerPage (PMP) is displayed. The PMP includes a SelectionBox configured to allow selection of faces and planes.

However, when the PMP is open, I’m unable to select anything in the graphics area. The viewport still responds to zoom and rotate, but no entities can be selected, either by clicking directly or by box selection.

Here’s a summary of what I’ve tried:

• The PMP is created using CreatePropertyManagerPage with the swPropertyManagerOptions_OkayCancel option.

• The SelectionBox is configured with filters: swSelFACES and swSelDATUMPLANES.

• The SelectionBox is visible and enabled.

• I am not storing the PMP instance in a global field (I instantiate it locally).

• I'm calling Application.DoEvents() before showing the PMP to ensure the UI is fully initialized.

• The issue occurs even when launched from a clean toolbar command, not from a TaskPane.

Still, no selection is possible.

Has anyone encountered this behavior or knows what might cause it? Any suggestions or known limitations I should be aware of?

Thanks in advance for your help!