How to close project property page

Any idea how can I close the property page? is there a method to close all project pages?

In my case I unloading the project, but property page remains open after unload with can cause some problems down the road.

Guid projectGUID = Guid.Empty;
IVsSolution.GetGuidOfProject(DTEUtil.GetIVsHierarchy(p), out projectGUID);
IVsSolution4.UnloadProject(ref projectGUID, (uint)_VSProjectUnloadStatus.UNLOADSTATUS_UnloadedByUser);