Triggering a user event from another PB app does not work in exe

I have a PB 12.6 app that is executing ll_rc = Send(window_handle_mdi_frame), 1024, 0, 0) to trigger the pbm_custom01 event in another PB application and it works just fine in the development environment but when I create an executable and start the receiving application using the exe, the receiving pbm_custom01 event does not fire when the Send(window_handle_mdi_frame), 1024, 0, 0) is executed. I am using FindWindow to get the handle and as I said when I run the application from PowerBuilder is responds like it should but does not when starting the receiving application from the deployed exe. What am I missing? I believe I have all the needed deployment dlls.