More small fixes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10683 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/grid.cpp

@@ -3503,6 +3503,8 @@ wxGrid::wxGrid( wxWindow *parent,
 
 wxGrid::~wxGrid()
 {
+    // Must do this or ~wxScrollHelper will pop the wrong event handler
+    SetTargetWindow(this);
     ClearAttrCache();
     wxSafeDecRef(m_defaultCellAttr);