diff --git a/ModuleFixTarget.py b/ModuleFixTarget.py
index 85d2f52..18999b0 100644
--- a/ModuleFixTarget.py
+++ b/ModuleFixTarget.py
@@ -16,7 +16,7 @@ This contains a Widget to handle FixTargetFrames and fiducials, calculate final
 import logging
 _log=logging.getLogger(__name__)
 
-import json, base64
+import json, base64, yaml
 import numpy as np
 import pyqtUsrObj as UsrGO
 import pyqtgraph as pg
@@ -161,6 +161,48 @@ class WndFixTarget(QWidget):
     act.triggered.connect(self.tree_ctx_delete)
     tree.addAction(act)
 
+    act = QAction("update param", self)
+    act.triggered.connect(self.tree_ctx_update)
+    tree.addAction(act)
+
+  def get_param(self):
+    param=self._txtParam.text().replace('(','[').replace(')',']').strip()
+    if param=='' or param[0]!='{':
+      param='{'+param+'}'
+    #mft._cbType.addItems(["Fiducial", "FixTarget(12.5x12.5)", "FixTarget(23.0x23.0)", "FixTarget(<param>)", "Grid(<param>)", "SwissMX-path"])
+    #bm_pos_eu=self._goBeamMarker._pos_eu
+    #bm_size_eu=self._goBeamMarker._size_eu
+    try:
+      #parse the parameters: 'key:value [,key:value]'
+      # as key value separator : and = are allowed
+      #examples:
+      #Fiducial:
+      #  no param
+      #FixTarget(12.5x12.5), FixTarget(23.0x23.0), FixTarget(test):
+      #  code_gen:2
+      #  code_gen=3 | tmove=10 | twait=30
+      #Grid():
+      #  size:(30, 20)
+      #  cnt:(30, 22)
+      #  fiducialSize:0.1
+      #SwissMX():
+      #  ofs:(.2, .2)
+      #  width:10
+      #  fidScl:.02
+      #  fiducial:((.1, .1), (.1, 2.7), (10.3, .1), (10.3, 2.7))
+      #SwissFEL():
+      #  ofs:(.2, .2)
+      #  width:10
+      #  fidScl:.02
+      #  fiducial:((.1, .1), (.1, 2.2), (10.3, .1), (10.3, 2.2))
+
+      param=param.replace(':', ': ')  # allow gen:4 without space
+      param=yaml.safe_load(param)  # "ofs":[10, 5],"width":200,"fidScl":0.5,"fiducial":[[18,7],[25,16],[70, 20]]
+    except BaseException as e:
+      _log.error(f'{e}:{param}')
+      param=dict()
+    return param
+
   def tree_get_path(self):
     path=[]
     it=self._tree.currentItem()
@@ -213,6 +255,21 @@ class WndFixTarget(QWidget):
         r1.translate(r2.center()-r1.center())
         vb.setRange(r1)
 
+  def tree_ctx_update(self):
+    app=QApplication.instance()
+    path=self.tree_get_path()
+    if len(path)==1:
+      try:
+        wnd=app._mainWnd
+      except AttributeError:
+        _log.info('_mainWnd not handeled')
+      else:
+        grp=wnd._goTracked
+        go=grp.childItems()[path[0]]
+        go._param=self.get_param()
+        data=grp.childItems()
+        self._tree.setData(data)
+
   def load_file(self, filename=None):
     app = QApplication.instance()
     if filename is None:
diff --git a/swissmx.py b/swissmx.py
index b9b8db8..4c033e6 100755
--- a/swissmx.py
+++ b/swissmx.py
@@ -2139,41 +2139,7 @@ object settings:
     bm_pos=self._goBeamMarker.pos()
     bm_sz=self._goBeamMarker.size()
     idx=mft._cbType.currentIndex()
-    param=mft._txtParam.text().replace('(','[').replace(')',']').strip()
-    if param=='' or param[0]!='{':
-      param='{'+param+'}'
-    #mft._cbType.addItems(["Fiducial", "FixTarget(12.5x12.5)", "FixTarget(23.0x23.0)", "FixTarget(<param>)", "Grid(<param>)", "SwissMX-path"])
-    #bm_pos_eu=self._goBeamMarker._pos_eu
-    #bm_size_eu=self._goBeamMarker._size_eu
-    try:
-      #parse the parameters: 'key:value [,key:value]'
-      # as key value separator : and = are allowed
-      #examples:
-      #Fiducial:
-      #  no param
-      #FixTarget(12.5x12.5), FixTarget(23.0x23.0), FixTarget(test):
-      #  code_gen:2
-      #  code_gen=3 | tmove=10 | twait=30
-      #Grid():
-      #  size:(30, 20)
-      #  cnt:(30, 22)
-      #  fiducialSize:0.1
-      #SwissMX():
-      #  ofs:(.2, .2)
-      #  width:10
-      #  fidScl:.02
-      #  fiducial:((.1, .1), (.1, 2.7), (10.3, .1), (10.3, 2.7))
-      #SwissFEL():
-      #  ofs:(.2, .2)
-      #  width:10
-      #  fidScl:.02
-      #  fiducial:((.1, .1), (.1, 2.2), (10.3, .1), (10.3, 2.2))
-
-      param=param.replace(':', ': ')  # allow gen:4 without space
-      param=yaml.safe_load(param)  # "ofs":[10, 5],"width":200,"fidScl":0.5,"fiducial":[[18,7],[25,16],[70, 20]]
-    except BaseException as e:
-      _log.error(f'{e}:{param}')
-      param=dict()
+    param=mft.get_param()
     if idx==0:
       #go=UsrGO.Fiducial(bm_pos+bm_sz/2-(20, 20), (40, 40),(fx,fy,bz))
       l=.120
@@ -2355,7 +2321,10 @@ object settings:
 
       sp.setup_sync(verbose=sp.verbose&0x40, timeOfs=dt_misc['time_ofs'], timeCor=dt_misc['time_cor'])
       dlg.setLabelText("Download motion program");dlg+=5
-      sp.setup_motion(fnPrg=fn+'.prg', **kwargs)
+      try:
+        sp.setup_motion(fnPrg=fn+'.prg', **kwargs)
+      except BaseException as e:
+        _log.error(repr(e));return
       sp.setup_gather()
       try:
         p=geo._fitPlane