Oops, test for parent being NULL in DoModalShow

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@7661 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/bitmap.tex

@@ -505,20 +505,14 @@ Sets the validity member (does not affect the bitmap data).
 
 \membersection{wxBitmap::SetPalette}\label{wxbitmapsetpalette}
 
-\func{void}{SetPalette}{\param{wxPalette* }{palette}}
+\func{void}{SetPalette}{\param{const wxPalette\& }{palette}}
 
-Sets the associated palette: it will be deleted in the wxBitmap
-destructor, so if you do not wish it to be deleted automatically,
-reset the palette to NULL before the bitmap is deleted.
+Sets the associated palette.
 
 \wxheading{Parameters}
 
 \docparam{palette}{The palette to set.}
 
-\wxheading{Remarks}
-
-The bitmap object owns the palette once this has been called.
-
 \wxheading{See also}
 
 \helpref{wxPalette}{wxpalette}

docs/latex/wx/dragimag.tex

@@ -195,3 +195,21 @@ will be smoother if you move the image when it is shown.
 
 Shows the image. Call this at least once when dragging.
 
+\membersection{wxDragImage::UpdateBackingFromWindow}\label{wxdragimageupdatebackingfromwindow}
+
+\constfunc{bool}{UpdateBackingFromWindow}{\param{wxDC\&}{ windowDC}, \param{wxMemoryDC\&}{ destDC},
+ \param{const wxRect\&}{ sourceRect}, \param{const wxRect\&}{ destRect}}
+
+Override this if you wish to draw the window contents to the backing bitmap
+yourself. This can be desirable if you wish to avoid flicker by not having to
+redraw the updated window itself just before dragging, which can cause a flicker just
+as the drag starts. Instead, paint the drag image's backing bitmap to show the appropriate
+graphic {\it minus the objects to be dragged}, and leave the window itself to be updated
+by the drag image. This can provide eerily smooth, flicker-free drag behaviour.
+
+The default implementation copies the window contents to the backing bitmap. A new
+implementation will normally copy information from another source, such as from its
+own backing bitmap if it has one, or directly from internal data structures.
+
+This function is available in wxGenericDragImage only.
+

src/msw/dialog.cpp

@@ -346,7 +346,8 @@ void wxDialog::DoShowModal()
         if ( !oldFocus )
         {
             oldFocus = parent;
-            hwndOldFocus = (HWND) parent->GetHWND();
+            if (parent)
+                hwndOldFocus = (HWND) parent->GetHWND();
         }
 
         // enter the modal loop