diff --git a/TODO.md b/TODO.md
index e49989d..9398c2b 100644
--- a/TODO.md
+++ b/TODO.md
@@ -28,9 +28,9 @@
 
 - [ ] create a crate for graphview/node/port
 - [x] Remove a port from a node if possible
-- [ ] Implement graphview unit test
+- [x] Implement graphview unit test
 - [x] add a css class for pad (presence always or sometimes)
-- [ ] Add property to port to store some specific value(Caps)
+- [x] Add property to port to store some specific value(Caps)
 
 ### GStreamer:
 
@@ -46,7 +46,7 @@
   - [ ] Create a window for the video output
 - [ ] Add multiple graphviews with tabs.
 - [x] Property window in the main window
-- [ ] Connect the GPS status to GST status
+- [x] Connect the GPS status to GST status
 - [ ] Implement graph dot render/load
 - [ ] Implement a command line parser to graph
 - [x] Render the parse launch line in a message box
@@ -63,6 +63,7 @@
 - [ ] Display tags/meta/message detected
 - [ ] Seek to position
 - [ ] Use one listbox with name, favorites and rank (sort list)
+- [x] See the link creation with a dashed line
 
 ### CI/Infra
 
diff --git a/src/app.rs b/src/app.rs
index 60c7e23..357fc12 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -30,6 +30,8 @@ use log::error;
 use once_cell::unsync::OnceCell;
 use std::cell::RefCell;
 use std::collections::HashMap;
+use std::fs::File;
+use std::io::{Read, Write};
 use std::ops;
 use std::rc::{Rc, Weak};
 
@@ -778,20 +780,25 @@ impl GPSApp {
     }
 
     fn clear_graph(&self) {
-        let graph_view = self.graphview.borrow_mut();
-        graph_view.remove_all_nodes();
+        let graph_view = self.graphview.borrow();
+        graph_view.clear();
     }
 
     fn save_graph(&self, filename: &str) -> anyhow::Result<()> {
         let graph_view = self.graphview.borrow();
-        graph_view.render_xml(filename)?;
+        let mut file = File::create(filename)?;
+        let buffer = graph_view.render_xml()?;
+        file.write_all(&buffer)?;
+
         Ok(())
     }
 
     fn load_graph(&self, filename: &str) -> anyhow::Result<()> {
-        self.clear_graph();
         let graph_view = self.graphview.borrow();
-        graph_view.load_xml(filename)?;
+        let mut file = File::open(filename)?;
+        let mut buffer = Vec::new();
+        file.read_to_end(&mut buffer).expect("buffer overflow");
+        graph_view.load_from_xml(buffer)?;
         Ok(())
     }
 }