diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/AsyncTreePanel.java b/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/AsyncTreePanel.java
index 1127221..62a5466 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/AsyncTreePanel.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/AsyncTreePanel.java
@@ -710,7 +710,6 @@ public class AsyncTreePanel extends LayoutContainer {
 	
 	private void reloadTreeLevelAndExpandFolder(final FolderModel folder, final boolean expandFolder){
 		
-		treePanel.mask(ConstantsExplorer.VALIDATINGOPERATION,ConstantsExplorer.LOADINGSTYLE);
 		AppControllerExplorer.rpcWorkspaceService.getFolderChildren(folder, new AsyncCallback<List<FileModel>>(){
 
 		@Override
@@ -728,11 +727,12 @@ public class AsyncTreePanel extends LayoutContainer {
 
 		@Override
 		public void onSuccess(List<FileModel> result) {
-			treePanel.unmask();
+			treePanel.mask(ConstantsExplorer.VALIDATINGOPERATION,ConstantsExplorer.LOADINGSTYLE);
 			store.removeAll(folder);
 //			addChildrenToFolder(folder.getIdentifier(), result);
 			addChildrenToFolder(folder, result);
 			setExpandTreeLevel(folder, expandFolder);
+			treePanel.unmask();
 		}
 	});