ClientWidth help from other OS's

I am working on a ProxyGadget and I need something from each platform. Could you post what this code returns for me?

Strict

Import MaxGUI.Drivers

Global window:TGadget=CreateWindow(AppTitle,0,0,640,480,Desktop(),1+2+WINDOW_CLIENTCOORDS+WINDOW_CENTER)
Global panel:TGadget=CreatePanel(5,5,150,ClientHeight(window)-10,window,PANEL_BORDER)

SetGadgetColor panel,128,128,128
Notify ClientWidth(panel)

Repeat
	WaitEvent()
	Select EventID()
		Case event_windowclose
			Select EventSource()
				Case window
					End
			EndSelect
	EndSelect
	Delay 5
Forever

I get 146 and I'm on a Win32 system.