Changed wxGrid::OnPaint to call Refresh on subwindows.

Added Refresh to wxGrid::EndBatch().
Use batch mode in sample.
Changed CalcDimension to better handle cases with zero columns or rows.
No more automatic insertion of column when adding rows to a grid without
        columns.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@6947 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/grid.h

@@ -1049,7 +1049,16 @@ public:
     // flicker
     //
     void     BeginBatch() { m_batchCount++; }
-    void     EndBatch() { if ( m_batchCount > 0 ) m_batchCount--; }
+    void     EndBatch()
+    {
+        if ( m_batchCount > 0 )
+	{
+	    m_batchCount--;
+	    if ( !m_batchCount )
+	        Refresh();
+	}
+    }
+
     int      GetBatchCount() { return m_batchCount; }