diff --git a/ChangeLog b/ChangeLog
index d08df8215..e9d8bc27a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,12 @@
-2008-12-06  Wolfgang Lux  <wlux@uni-muenster.de>
+2008-12-06  Wolfgang Lux  <wolfgang.lux@gmail.com>
+
+	* Source/NSSavePanel.m (-_reloadBrowser:, -setRequiredFileType:,
+	-setAllowedFileTypes:, -setTreatsFilePackagesAsDirectories:):
+	* Source/NSOpenPanel.m (-_setupForTypes:, -setCanChooseFiles:)
+	-runModal..., -beginSheet...): Update the panels' browser when the
+	list of visible file extensions is changed programmatically.
+
+2008-12-06  Wolfgang Lux  <wolfgang.lux@gmail.com>
 
 	* Headers/AppKit/NSSavePanel.h:
 	* Source/NSSavePanel.m (-requiredFileType, -setRequiredFileType:,
diff --git a/Source/NSOpenPanel.m b/Source/NSOpenPanel.m
index 40927f07c..8d378f8e2 100644
--- a/Source/NSOpenPanel.m
+++ b/Source/NSOpenPanel.m
@@ -74,9 +74,11 @@ static NSOpenPanel *_gs_gui_open_panel = nil;
 @interface NSSavePanel (GSPrivateMethods)
 - (void) _resetDefaults;
 - (void) _updateDefaultDirectory;
+- (void) _reloadBrowser;
 - (void) _selectCellName: (NSString *)title;
 - (void) _selectTextInColumn: (int)column;
 - (void) _setupForDirectory: (NSString *)path file: (NSString *)filename;
+- (void) _setupForTypes: (NSArray *)fileTypes; /* I'm cheating here... */
 - (BOOL) _shouldShowExtension: (NSString *)extension isDir: (BOOL *)isDir;
 - (NSComparisonResult) _compareFilename: (NSString *)n1 with: (NSString *)n2;
 @end
@@ -236,6 +238,16 @@ static NSOpenPanel *_gs_gui_open_panel = nil;
   [super _setupForDirectory: path file: filename];
 }
 
+- (void) _setupForTypes: (NSArray *)fileTypes
+{
+  if (_fileTypes != fileTypes)
+    {
+      BOOL reload = ![_fileTypes isEqual: fileTypes];
+      ASSIGN (_fileTypes, fileTypes);
+      if (reload)
+	[self _reloadBrowser];
+    }
+}
 @end
 
 /** 
@@ -348,7 +360,11 @@ static NSOpenPanel *_gs_gui_open_panel = nil;
 */
 - (void) setCanChooseFiles: (BOOL)flag
 {
-  _canChooseFiles = flag;
+  if (flag != _canChooseFiles)
+    {
+      _canChooseFiles = flag;
+      [self _reloadBrowser];
+    }
 }
 
 /**<p>Returns YES if the user is allowed to choose files.  The
@@ -460,8 +476,7 @@ static NSOpenPanel *_gs_gui_open_panel = nil;
 			file: (NSString *)name
 		       types: (NSArray *)fileTypes
 {
-  ASSIGN (_fileTypes, fileTypes);
-
+  [self _setupForTypes: fileTypes];
   return [self runModalForDirectory: path 
 			       file: name];  
 }
@@ -471,8 +486,7 @@ static NSOpenPanel *_gs_gui_open_panel = nil;
 		       types: (NSArray *)fileTypes
 	    relativeToWindow: (NSWindow*)window
 {
-  ASSIGN (_fileTypes, fileTypes);
-
+  [self _setupForTypes: fileTypes];
   return [self runModalForDirectory: path 
 			       file: name
 		   relativeToWindow: window];
@@ -486,8 +500,7 @@ static NSOpenPanel *_gs_gui_open_panel = nil;
 		 didEndSelector: (SEL)didEndSelector
 		    contextInfo: (void *)contextInfo
 {
-  ASSIGN (_fileTypes, fileTypes);
-
+  [self _setupForTypes: fileTypes];
   [self beginSheetForDirectory: path
 			  file: name
 		modalForWindow: docWindow
diff --git a/Source/NSSavePanel.m b/Source/NSSavePanel.m
index 9091cc9dd..fd1f7cccb 100644
--- a/Source/NSSavePanel.m
+++ b/Source/NSSavePanel.m
@@ -110,6 +110,7 @@ setPath(NSBrowser *browser, NSString *path)
 - (void) _setDefaultDirectory;
 - (void) _updateDefaultDirectory;
 - (void) _resetDefaults;
+- (void) _reloadBrowser;
 // Methods invoked by buttons
 - (void) _setHomeDirectory;
 - (void) _mountMedia;
@@ -418,6 +419,13 @@ setPath(NSBrowser *browser, NSString *path)
   [self setAccessoryView: nil];
 }
 
+- (void) _reloadBrowser
+{
+  NSString *path = [_browser path];
+  [_browser loadColumnZero];
+  setPath(_browser, path);
+}
+
 //
 // Methods invoked by button press
 //
@@ -590,7 +598,7 @@ selectCellWithString: (NSString*)title
     {
       if (_allowedFileTypes != nil
           && [_allowedFileTypes indexOfObject: extension] == NSNotFound
-	  && [_allowedFileTypes indexOfObject: @""] != NSNotFound)
+	  && [_allowedFileTypes indexOfObject: @""] == NSNotFound)
 	return NO;
     }
   else if ([extension length] == 0)
@@ -935,10 +943,13 @@ selectCellWithString: (NSString*)title
  */
 - (void) setRequiredFileType: (NSString*)fileType
 {
+  NSArray *fileTypes;
+
   if ([fileType length] == 0)
-    DESTROY(_allowedFileTypes);
+    fileTypes = nil;
   else
-    ASSIGN(_allowedFileTypes, [NSArray arrayWithObject: fileType]);
+    fileTypes = [NSArray arrayWithObject: fileType];
+  [self setAllowedFileTypes: fileTypes];
 }
 
 /**<p>Returns the required file type.  The default, indicated by an empty
@@ -966,10 +977,14 @@ selectCellWithString: (NSString*)title
  */
 - (void) setAllowedFileTypes: (NSArray *)types
 {
-  if ([types count] == 0)
-    DESTROY(_allowedFileTypes);
-  else
-    ASSIGN(_allowedFileTypes, types);
+  if (types != _allowedFileTypes)
+    {
+      if ([types count] == 0)
+   	DESTROY(_allowedFileTypes);
+      else
+	ASSIGN(_allowedFileTypes, types);
+      [self _reloadBrowser];
+    }
 }
 
 /**<p>Returns an array of the allowed file types. The default, indicated by
@@ -1006,7 +1021,11 @@ selectCellWithString: (NSString*)title
  */
 - (void) setTreatsFilePackagesAsDirectories: (BOOL)flag
 {
-  _treatsFilePackagesAsDirectories = flag;
+  if (flag != _treatsFilePackagesAsDirectories)
+    {
+      _treatsFilePackagesAsDirectories = flag;
+      [self _reloadBrowser];
+    }
 }
 
 /**<p> Validates and possibly reloads the browser columns that are visible