diff --git a/MP.MONO.UI/Components/ParamOverview.razor b/MP.MONO.UI/Components/ParamOverview.razor
index f7a754c..596d6fc 100644
--- a/MP.MONO.UI/Components/ParamOverview.razor
+++ b/MP.MONO.UI/Components/ParamOverview.razor
@@ -41,8 +41,6 @@
             </li>
         }
     </ul>
-
-
 }
 else
 {
diff --git a/MP.MONO.UI/Components/ParamOverview.razor.cs b/MP.MONO.UI/Components/ParamOverview.razor.cs
index e3ef531..a9ecdac 100644
--- a/MP.MONO.UI/Components/ParamOverview.razor.cs
+++ b/MP.MONO.UI/Components/ParamOverview.razor.cs
@@ -15,7 +15,8 @@ namespace MP.MONO.UI.Components
 
         #region Private Methods
 
-        private string SelVal = "";
+        [Parameter]
+        public string SelVal { get; set;  } = "";
 
 
 
diff --git a/MP.MONO.UI/Components/ParamPlot.razor b/MP.MONO.UI/Components/ParamPlot.razor
index d26a4d1..f17c2a2 100644
--- a/MP.MONO.UI/Components/ParamPlot.razor
+++ b/MP.MONO.UI/Components/ParamPlot.razor
@@ -7,43 +7,46 @@
 
 @inject CurrentDataService MMDataService
 
-<div class="d-flex justify-content-between mb-2">
-    <div class="px-1">
-        <b>@SelectedParam</b>
-    </div>
-    <div class="px-1">
-        <div class=" input-group input-group-sm">
-            <button class="btn btn-primary" @onclick="() => toggleParam()">
+@if (!string.IsNullOrEmpty(@SelectedParam))
+{
+    <div class="d-flex justify-content-between mb-2">
+        <div class="px-1">
+            <b>@SelectedParam</b>
+        </div>
+        <div class="px-1">
+            <div class=" input-group input-group-sm">
+                <button class="btn btn-primary" @onclick="() => toggleParam()">
+                    @if (showParam)
+                    {
+                        <i class="fa-solid fa-chevron-right"></i>
+                    }
+                    else
+                    {
+                        <i class="fa-solid fa-chevron-left"></i>
+                    }
+                </button>
                 @if (showParam)
                 {
-                    <i class="fa-solid fa-chevron-right"></i>
-                }
-                else
-                {
-                    <i class="fa-solid fa-chevron-left"></i>
-                }
-            </button>
-            @if (showParam)
-            {
 
-                <span class="input-group-text small">Num Rec</span>
-                <input class="form-control" @bind="@maxRecord" />
-                <span class="input-group-text small">Sample Sec Time</span>
-                <input class="form-control" @bind="@sampleSecMin" />
+                    <span class="input-group-text small">Num Rec</span>
+                    <input class="form-control" @bind="@maxRecord" />
+                    <span class="input-group-text small">Sample Sec Time</span>
+                    <input class="form-control" @bind="@sampleSecMin" />
+                }
+            </div>
+        </div>
+    </div>
+    <div class="d-flex">
+        <div class="px-1 flex-fill">
+            @if (LevelVal == null || LevelVal.Count == 0)
+            {
+                <LoadingDataSmall></LoadingDataSmall>
+            }
+            else
+            {
+                <MP.MONO.UI.Components.Chart.Line AspRatio="4" DataTS="@LevelVal" lineColor="@getLineColors("0.75")" backColor="@getFillColors("0.25")" pointColor="@getPointColors("1")" lTens="0" MinValue="@MinVal" MaxValue="@MaxVal"></MP.MONO.UI.Components.Chart.Line>
             }
         </div>
     </div>
-</div>
-<div class="d-flex">
-    <div class="px-1 flex-fill">
-        @if (LevelVal == null || LevelVal.Count == 0)
-        {
-            <LoadingDataSmall></LoadingDataSmall>
-        }
-        else
-        {
-            <MP.MONO.UI.Components.Chart.Line AspRatio="4" DataTS="@LevelVal" lineColor="@getLineColors("0.75")" backColor="@getFillColors("0.25")" pointColor="@getPointColors("1")" lTens="0" MinValue="@MinVal" MaxValue="@MaxVal"></MP.MONO.UI.Components.Chart.Line>
-        }
-    </div>
-</div>
+}
 
diff --git a/MP.MONO.UI/Components/ParamPlot.razor.cs b/MP.MONO.UI/Components/ParamPlot.razor.cs
index adc33c1..3051011 100644
--- a/MP.MONO.UI/Components/ParamPlot.razor.cs
+++ b/MP.MONO.UI/Components/ParamPlot.razor.cs
@@ -18,26 +18,31 @@ namespace MP.MONO.UI.Components
 
         protected DateTime lastRec = DateTime.Now.AddMinutes(-1);
 
+        protected Dictionary<string, string> listMaxVal = new Dictionary<string, string>();
+        protected Dictionary<string, string> listMinVal = new Dictionary<string, string>();
         protected Dictionary<string, List<chartJsData.chartJsTSerie>> plotData = new Dictionary<string, List<chartJsData.chartJsTSerie>>();
 
-        protected List<chartJsData.chartJsTSerie> LevelVal
-        {
-            get => plotData[SelectedParam] ?? new List<chartJsData.chartJsTSerie>();
-        }
         protected double sampleSecMin = 1;
 
         #endregion Protected Fields
 
-        #region Private Properties
-
-        private List<DisplayDataDTO>? ListRecords { get; set; } = null;
-
-        #endregion Private Properties
-
         #region Protected Properties
 
         protected string _selParam { get; set; } = "";
 
+        protected List<chartJsData.chartJsTSerie> LevelVal
+        {
+            get
+            {
+                List<chartJsData.chartJsTSerie> answ = new List<chartJsData.chartJsTSerie>();
+                if (plotData.ContainsKey(SelectedParam))
+                {
+                    answ = plotData[SelectedParam];
+                }
+                return answ;
+            }
+        }
+
         protected string? MaxVal
         {
             get => listMaxVal[SelectedParam] ?? "0";
@@ -48,10 +53,6 @@ namespace MP.MONO.UI.Components
             get => listMinVal[SelectedParam] ?? "0";
         }
 
-        protected Dictionary<string, string> listMinVal = new Dictionary<string, string>();
-        protected Dictionary<string, string> listMaxVal = new Dictionary<string, string>();
-
-
         #endregion Protected Properties
 
         #region Public Properties
diff --git a/MP.MONO.UI/Pages/Parameters.razor b/MP.MONO.UI/Pages/Parameters.razor
index 2288553..3c0afaa 100644
--- a/MP.MONO.UI/Pages/Parameters.razor
+++ b/MP.MONO.UI/Pages/Parameters.razor
@@ -1,7 +1,5 @@
 @page "/Parameters"
 
-
-
 <div class="card">
     <div class="card-header">
         <div class="d-flex justify-content-between">
@@ -16,17 +14,17 @@
     <div class="card-body">
         <div class="row">
             <div class="col-4">
-                <ParamOverview EC_SelValue="paramSelected"></ParamOverview>
+                <ParamOverview SelVal="@selParam" EC_SelValue="paramSelected"></ParamOverview>
             </div>
             <div class="col-8">
                 @if (string.IsNullOrEmpty(selParam))
                 {
-                    <p>please select to plot parameter</p>
+                    <p>&larr; please select an item to plot graph</p>
                 }
                 else
                 {
-                    <ParamPlot SelectedParam="@selParam"></ParamPlot>
                 }
+                    <ParamPlot SelectedParam="@selParam"></ParamPlot>
             </div>
         </div>
     </div>