MSWord closes unexpectedly when clicking "Print" button in "Envelopes and Labels" dialog

Question

I'm embedding MSWord in my WinForms app using Microsoft Library, and I'm following this guideline to set the window style to ws_child to support the child window. However, when I click the "Print" button in the "Envelopes and Labels" dialog, MSWord unexpectedly closes. The issue is resolved when I remove the style setting or set it to ws_popup, but using ws_popup goes against the guideline. Can anyone guide me on how to resolve this issue while following the guidelines?