Must show a dialog for it to be useful.

eeschema/tools/sch_drawing_tools.cpp

@@ -1580,6 +1580,7 @@ int SCH_DRAWING_TOOLS::SingleClickPlace( const TOOL_EVENT& aEvent )
                     strokeItems.push_back( previewItem );
 
                     DIALOG_WIRE_BUS_PROPERTIES dlg( m_frame, strokeItems );
+                    dlg.ShowModal();
                     break;
                 }
 
@@ -1589,6 +1590,7 @@ int SCH_DRAWING_TOOLS::SingleClickPlace( const TOOL_EVENT& aEvent )
                     junctions.push_back( static_cast<SCH_JUNCTION*>( previewItem ) );
 
                     DIALOG_JUNCTION_PROPS dlg( m_frame, junctions );
+                    dlg.ShowModal();
                     break;
                 }