diff --git a/src/ce_projconf.pas b/src/ce_projconf.pas
index 6d5f14a5..c743264f 100644
--- a/src/ce_projconf.pas
+++ b/src/ce_projconf.pas
@@ -52,6 +52,7 @@ type
     procedure projCompiling(aProject: TCEProject);
   protected
     procedure UpdateByEvent; override;
+    procedure SetVisible(Value: boolean); override;
   public
     constructor create(aOwner: TComponent); override;
     destructor destroy; override;
@@ -90,6 +91,13 @@ begin
   EntitiesConnector.removeObserver(self);
   inherited;
 end;
+
+procedure TCEProjectConfigurationWidget.SetVisible(Value: boolean);
+begin
+  inherited;
+  if Visible then UpdateByEvent;
+end;
+
 {$ENDREGION --------------------------------------------------------------------}
 
 {$REGION ICEProjectObserver ----------------------------------------------------}
@@ -97,7 +105,7 @@ procedure TCEProjectConfigurationWidget.projNew(aProject: TCEProject);
 begin
   beginUpdateByEvent;
   fProj := aProject;
-  endUpdateByEvent;
+  if Visible then UpdateByEvent;
   syncroMode := false;
 end;
 
@@ -114,18 +122,15 @@ end;
 
 procedure TCEProjectConfigurationWidget.projChanged(aProject: TCEProject);
 begin
-  if fProj <> aProject then
-    exit;
-  beginUpdateByEvent;
+  if fProj <> aProject then exit;
   fProj := aProject;
-  endUpdateByEvent;
+  if Visible then UpdateByEvent;
 end;
 
 procedure TCEProjectConfigurationWidget.projFocused(aProject: TCEProject);
 begin
-  beginUpdateByEvent;
   fProj := aProject;
-  endUpdateByEvent;
+  if Visible then UpdateByEvent;
 end;
 
 procedure TCEProjectConfigurationWidget.projCompiling(aProject: TCEProject);
@@ -359,10 +364,11 @@ var
 begin
   selConf.ItemIndex:= -1;
   selConf.Clear;
+  if fProj = nil then exit;
+  //
   for i:= 0 to fProj.OptionsCollection.Count-1 do
     selConf.Items.Add(fProj.configuration[i].name);
   selConf.ItemIndex := fProj.ConfigurationIndex;
-
   inspector.TIObject := getGridTarget;
 end;
 {$ENDREGION --------------------------------------------------------------------}
diff --git a/src/ce_projinspect.pas b/src/ce_projinspect.pas
index 41791baa..b9bfb00f 100644
--- a/src/ce_projinspect.pas
+++ b/src/ce_projinspect.pas
@@ -31,6 +31,7 @@ type
     procedure TreeSelectionChanged(Sender: TObject);
   protected
     procedure UpdateByEvent; override;
+    procedure SetVisible(Value: boolean); override;
   private
     fActOpenFile: TAction;
     fActSelConf: TAction;
@@ -111,6 +112,11 @@ begin
   inherited;
 end;
 
+procedure TCEProjectInspectWidget.SetVisible(Value: boolean);
+begin
+  inherited;
+  if Value then UpdateByEvent;
+end;
 {$ENDREGION}
 
 {$REGION ICEContextualActions---------------------------------------------------}
@@ -143,7 +149,7 @@ end;
 procedure TCEProjectInspectWidget.projNew(aProject: TCEProject);
 begin
   fProject := aProject;
-  UpdateByEvent;
+  if Visible then UpdateByEvent;
 end;
 
 procedure TCEProjectInspectWidget.projClosing(aProject: TCEProject);
@@ -157,14 +163,13 @@ end;
 procedure TCEProjectInspectWidget.projFocused(aProject: TCEProject);
 begin
   fProject := aProject;
-  UpdateByEvent;
+  if Visible then UpdateByEvent;
 end;
 
 procedure TCEProjectInspectWidget.projChanged(aProject: TCEProject);
 begin
-  if fProject <> aProject then
-    exit;
-  UpdateByEvent;
+  if fProject <> aProject then exit;
+  if Visible then UpdateByEvent;
 end;
 
 procedure TCEProjectInspectWidget.projCompiling(aProject: TCEProject);
diff --git a/src/ce_staticexplorer.pas b/src/ce_staticexplorer.pas
index cb87c909..0a76df39 100644
--- a/src/ce_staticexplorer.pas
+++ b/src/ce_staticexplorer.pas
@@ -76,6 +76,8 @@ type
     function contextName: string; override;
     function contextActionCount: integer; override;
     function contextAction(index: integer): TAction; override;
+    //
+    procedure SetVisible(Value: boolean); override;
   published
     property autoRefresh: boolean read fAutoRefresh write fAutoRefresh;
     property refreshOnChange: boolean read fRefreshOnChange write fRefreshOnChange;
@@ -160,6 +162,13 @@ begin
   fLogMessager.Free;
   inherited;
 end;
+
+procedure TCEStaticExplorerWidget.SetVisible(Value: boolean);
+begin
+  inherited;
+  if Value then
+    produceJsonInfo;
+end;
 {$ENDREGION}
 
 {$REGION ICESessionOptionsObserver ---------------------------------------------}
@@ -277,6 +286,8 @@ end;
 procedure TCEStaticExplorerWidget.docFocused(aDoc: TCESynMemo);
 begin
   fDoc := aDoc;
+  if not Visible then exit;
+  //
   if fAutoRefresh then beginUpdateByDelay
   else if fRefreshOnFocus then produceJsonInfo;
 end;
@@ -284,10 +295,10 @@ end;
 procedure TCEStaticExplorerWidget.docChanged(aDoc: TCESynMemo);
 begin
   if fDoc <> aDoc then exit;
-  if fAutoRefresh then
-    beginUpdateByDelay
-  else if fRefreshOnChange then
-    produceJsonInfo;
+  if not Visible then exit;
+  //
+  if fAutoRefresh then beginUpdateByDelay
+  else if fRefreshOnChange then produceJsonInfo;
 end;
 {$ENDREGION}
 
diff --git a/src/ce_todolist.pas b/src/ce_todolist.pas
index db888b76..1ef14fed 100644
--- a/src/ce_todolist.pas
+++ b/src/ce_todolist.pas
@@ -89,6 +89,8 @@ type
     procedure lstItemsDoubleClick(sender: TObject);
     procedure btnRefreshClick(sender: TObject);
     procedure filterItems(sender: TObject);
+  protected
+    procedure SetVisible(Value: boolean); override;
   public
     constructor create(aOwner: TComponent); override;
     destructor destroy; override;
@@ -185,6 +187,14 @@ begin
   fLogMessager.Free;
   inherited;
 end;
+
+procedure TCETodoListWidget.SetVisible(Value: boolean);
+begin
+  inherited;
+  if Value then
+    callToolProcess;
+end;
+
 {$ENDREGION}
 
 {$REGION ICEMultiDocObserver ---------------------------------------------------}
@@ -195,7 +205,8 @@ end;
 procedure TCETodoListWidget.docFocused(aDoc: TCESynMemo);
 begin
   fDoc := aDoc;
-  callToolProcess;
+  if Visible then
+    callToolProcess;
 end;
 
 procedure TCETodoListWidget.docChanged(aDoc: TCESynMemo);
@@ -220,7 +231,8 @@ end;
 procedure TCETodoListWidget.projChanged(aProject: TCEProject);
 begin
   if fProj <> aProject then exit;
-  callToolProcess;
+  if Visible then
+    callToolProcess;
 end;
 
 procedure TCETodoListWidget.projClosing(aProject: TCEProject);
@@ -233,7 +245,8 @@ end;
 procedure TCETodoListWidget.projFocused(aProject: TCEProject);
 begin
   fProj := aProject;
-  callToolProcess;
+  if Visible then
+    callToolProcess;
 end;
 
 procedure TCETodoListWidget.projCompiling(aProject: TCEProject);