How to hide menu, command, property view ... ? (MFC/Rhino5)

Oke if you want to hide the toolbars do something like this:

For i = 0 To Rhino.RhinoApp.ToolbarFiles.Count - 1
     Rhino.RhinoApp.ToolbarFiles(0).Close(False)
Next

Next. For loading your toolbar:

Rhino.RhinoApp.ToolbarFiles.Open("C:\....\mytoolbar.RUI")

Some helpful macros

//toggle commandprompt
"-_commandprompt _show _toggle_enter"

//Toggle menu show/hide
"-_menu"

Hiding all panels:

For Each panel In Rhino.UI.Panels.GetOpenPanelIds
     Rhino.UI.Panels.ClosePanel(panel)
Next

This should bring you close to what you want I guess xD