--- a/dwt/widgets/DirectoryDialog.d	Sun Jun 08 15:11:48 2008 +0200
+++ b/dwt/widgets/DirectoryDialog.d	Sun Jun 15 22:32:20 2008 +0200
@@ -24,7 +24,6 @@
 import dwt.widgets.Display;
 
 static import tango.io.FileConst;
-static import tango.stdc.stringz;
 static import tango.text.Util;
 
 /**
@@ -131,7 +130,7 @@
     }
 }
 String openChooserDialog () {
-    char* titleBytes = tango.stdc.stringz.toStringz(title);
+    char* titleBytes = toStringz(title);
     auto shellHandle = parent.topHandle ();
     auto handle = OS.gtk_file_chooser_dialog_new2 (
         titleBytes,
@@ -154,7 +153,7 @@
         else{
             p = filterPath;
         }
-        char* buffer = tango.stdc.stringz.toStringz(p);
+        char* buffer = toStringz(p);
         /*
         * Bug in GTK. GtkFileChooser may crash on GTK versions 2.4.10 to 2.6
         * when setting a file name that is not a true canonical path.
@@ -167,7 +166,7 @@
         }
     }
     if (message.length > 0) {
-        char* buffer = tango.stdc.stringz.toStringz(message);
+        char* buffer = toStringz(message);
         auto box = OS.gtk_hbox_new (false, 0);
         if (box is null) error (DWT.ERROR_NO_HANDLES);
         auto label = OS.gtk_label_new (buffer);
@@ -220,7 +219,7 @@
     return answer;
 }
 String openClassicDialog () {
-    char* titleBytes = tango.stdc.stringz.toStringz(title);
+    char* titleBytes = toStringz(title);
     auto handle = OS.gtk_file_selection_new (titleBytes);
     if (parent !is null) {
         auto shellHandle = parent.topHandle ();
@@ -237,7 +236,7 @@
         if (path.length > 0 && path[ $-1 .. $ ] != SEPARATOR ) {
             path ~= SEPARATOR;
         }
-        char* fileNamePtr = OS.g_filename_from_utf8 (tango.stdc.stringz.toStringz(path), -1, null, null, null);
+        char* fileNamePtr = OS.g_filename_from_utf8 (toStringz(path), -1, null, null, null);
         OS.gtk_file_selection_set_filename (handle, fileNamePtr);
         OS.g_free (fileNamePtr);
     }
@@ -247,7 +246,7 @@
     OS.gtk_widget_hide (selection.file_list);
     OS.gtk_widget_hide (fileListParent);
     if (message.length > 0) {
-        auto labelHandle = OS.gtk_label_new (tango.stdc.stringz.toStringz(message));
+        auto labelHandle = OS.gtk_label_new (toStringz(message));
         OS.gtk_label_set_line_wrap (labelHandle, true);
         OS.gtk_misc_set_alignment (labelHandle, 0.0f, 0.0f);
         OS.gtk_container_add (selection.main_vbox, labelHandle);
@@ -321,12 +320,10 @@
  *
  * @param string the message
  *
- * @exception IllegalArgumentException <ul>
- *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
- * </ul>
  */
 public void setMessage (String string) {
-    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
+    // DWT extension: allow null for zero length string
+    //if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
     message = string.dup;
 }
 }