--- a/dwt/dwthelper/utils.d	Sat Mar 08 23:00:05 2008 +0100
+++ b/dwt/dwthelper/utils.d	Sun Mar 09 10:58:49 2008 +0100
@@ -320,6 +320,16 @@
     return typeid(char[]).getHash(&src);
 }
 
+public char* toStringzValidPtr( char[] src ){
+    if( src ){
+        return src.toStringz();
+    }
+    else{
+        static const char[] nullPtr = "\0";
+        return nullPtr.ptr;
+    }
+}
+
 static char[] toHex(uint value, bool prefix = true, int radix = 8){
     return tango.text.convert.Integer.toString(
             value,

--- a/dwt/widgets/Label.d	Sat Mar 08 23:00:05 2008 +0100
+++ b/dwt/widgets/Label.d	Sun Mar 09 10:58:49 2008 +0100
@@ -21,7 +21,7 @@
 import dwt.widgets.Composite;
 import dwt.widgets.ImageList;
 
-import tango.stdc.stringz;
+import dwt.dwthelper.utils;
 
 /**
  * Instances of this class represent a non-selectable
@@ -567,11 +567,12 @@
  */
 public void setText (char[] string) {
     checkWidget ();
-    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);
     if ((style & DWT.SEPARATOR) !is 0) return;
     text = string;
     char [] chars = fixMnemonic (string);
-    OS.gtk_label_set_text_with_mnemonic (cast(GtkLabel*)labelHandle, toStringz(chars));
+    OS.gtk_label_set_text_with_mnemonic (cast(GtkLabel*)labelHandle, chars.toStringzValidPtr());
     OS.gtk_widget_hide (imageHandle);
     OS.gtk_widget_show (labelHandle);
 }