--- a/dwt/dnd/DropTarget.d	Wed Dec 31 15:17:35 2008 +0100
+++ b/dwt/dnd/DropTarget.d	Wed Dec 31 15:32:40 2008 +0100
@@ -40,6 +40,8 @@
 import dwt.widgets.Tree;
 import dwt.widgets.Widget;
 
+import tango.core.Thread;
+
 import dwt.dnd.DND;
 import dwt.dnd.DNDEvent;
 import dwt.dnd.DNDListener;
@@ -48,6 +50,7 @@
 import dwt.dnd.TableDropTargetEffect;
 import dwt.dnd.Transfer;
 import dwt.dnd.TransferData;
+import dwt.dnd.TreeDropTargetEffect;
 import dwt.dwthelper.array;
 import dwt.internal.objc.cocoa.Cocoa;
 import objc = dwt.internal.objc.runtime;
@@ -391,9 +394,9 @@
 
     addDragHandlers();  
 }
-
+extern (C) {
 static objc.id dropTargetProc2(objc.id id, objc.SEL sel) {
-    Display display = Display.findDisplay(Thread.currentThread());
+    Display display = Display.findDisplay(Thread.getThis());
     if (display is null || display.isDisposed()) return null;
     Widget widget = display.findWidget(id);
     if (widget is null) return null;
@@ -401,14 +404,14 @@
     if (dt is null) return null;
 
     if (sel is OS.sel_wantsPeriodicDraggingUpdates) {
-        return dt.wantsPeriodicDraggingUpdates() ? 1 : 0;
+        return dt.wantsPeriodicDraggingUpdates() ? cast(objc.id) 1 : null;
     }
     
     return null;
 }
 
 static objc.id dropTargetProc3(objc.id id, objc.SEL sel, objc.id arg0) {
-    Display display = Display.findDisplay(Thread.currentThread());
+    Display display = Display.findDisplay(Thread.getThis());
     if (display is null || display.isDisposed()) return null;
     Widget widget = display.findWidget(id);
     if (widget is null) return null;
@@ -420,9 +423,9 @@
     NSObject sender = new NSObject(arg0);
     
     if (sel is OS.sel_draggingEntered_) {
-        return dt.draggingEntered(sender);
+        return cast(objc.id) dt.draggingEntered(sender);
     } else if (sel is OS.sel_draggingUpdated_) {
-        return dt.draggingUpdated(sender);
+        return cast(objc.id) dt.draggingUpdated(sender);
     } else if (sel is OS.sel_draggingExited_) {
         dt.draggingExited(sender);
     } else if (sel is OS.sel_performDragOperation_) {
@@ -430,7 +433,7 @@
     }
     
     return null;
-}
+}}
 
 /**
  * Returns the Control which is registered for this DropTarget.  This is the control over which the 
@@ -536,7 +539,7 @@
 }
 
 int opToOsOp(int operation) {
-    NSDragOperation osOperation = 0;
+    NSDragOperation osOperation;
     if ((operation & DND.DROP_COPY) !is 0){
         osOperation |= OS.NSDragOperationCopy;
     }