The following code works on the desktop and according to the documentation is should also work on a Windows CE device.
obj is an Object from the Door library.
B4X:
Sub App_Start
Form1.Show
obj.New1(False)
obj.CreateNew("System.Windows.Forms.Cursor" & obj.System_Windows_Forms)
obj.RunMethod("Hide")
'obj.RunMethod("Show") 'Show the cursor
End Sub