Fix EndEdit to use the newvalue/None as the return value instead of bool and a parameter pass-through.

Add first grid sample.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73502 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/grid/simple.py

@@ -0,0 +1,15 @@
+import wx
+import wx.grid
+
+class TestFrame(wx.Frame):
+    def __init__(self, *args, **kw):
+        wx.Frame.__init__(self, *args, **kw)
+        self.grid = wx.grid.Grid(self)
+        self.grid.CreateGrid(25, 25)
+        
+        
+app = wx.App()
+frm = TestFrame(None, title="Simple Test Grid")
+frm.Show()
+app.MainLoop()
+