diff --git a/applications/lazstats/source/forms/analysis/descriptive/frequnit.lfm b/applications/lazstats/source/forms/analysis/descriptive/frequnit.lfm
index 4c903ff20..3cef52781 100644
--- a/applications/lazstats/source/forms/analysis/descriptive/frequnit.lfm
+++ b/applications/lazstats/source/forms/analysis/descriptive/frequnit.lfm
@@ -8,24 +8,36 @@ inherited FreqFrm: TFreqFrm
   Caption = 'Frequency Distribution'
   ClientHeight = 385
   ClientWidth = 835
-  OnActivate = FormActivate
-  OnCreate = FormCreate
-  Position = poMainFormCenter
-  object ParamsPanel: TPanel[0]
-    Left = 8
+  inherited ParamsPanel: TPanel
     Height = 369
-    Top = 8
     Width = 264
-    Align = alLeft
-    BorderSpacing.Left = 8
-    BorderSpacing.Top = 8
-    BorderSpacing.Right = 4
-    BorderSpacing.Bottom = 8
-    BevelOuter = bvNone
     ClientHeight = 369
     ClientWidth = 264
-    TabOrder = 0
-    object Panel1: TPanel
+    inherited CloseBtn: TButton
+      Left = 209
+      Top = 344
+      TabOrder = 4
+    end
+    inherited ComputeBtn: TButton
+      Left = 125
+      Top = 344
+      TabOrder = 5
+    end
+    inherited ResetBtn: TButton
+      Left = 63
+      Top = 344
+      TabOrder = 6
+    end
+    inherited HelpBtn: TButton
+      Left = 4
+      Top = 344
+      TabOrder = 7
+    end
+    inherited ButtonBevel: TBevel
+      Top = 328
+      Width = 264
+    end
+    object Panel1: TPanel[5]
       AnchorSideLeft.Control = ParamsPanel
       AnchorSideTop.Control = ParamsPanel
       AnchorSideRight.Control = ParamsPanel
@@ -142,7 +154,7 @@ inherited FreqFrm: TFreqFrm
         TabOrder = 3
       end
     end
-    object NormPltChk: TCheckBox
+    object NormPltChk: TCheckBox[6]
       AnchorSideLeft.Control = ParamsPanel
       AnchorSideLeft.Side = asrCenter
       AnchorSideTop.Side = asrBottom
@@ -157,76 +169,12 @@ inherited FreqFrm: TFreqFrm
       Caption = 'Plot Normal Distribution'
       TabOrder = 1
     end
-    object Bevel1: TBevel
-      AnchorSideLeft.Control = ParamsPanel
-      AnchorSideRight.Control = ParamsPanel
-      AnchorSideRight.Side = asrBottom
-      AnchorSideBottom.Control = CloseBtn
-      Left = 0
-      Height = 8
-      Top = 328
-      Width = 264
-      Anchors = [akLeft, akRight, akBottom]
-      Shape = bsBottomLine
-    end
-    object ResetBtn: TButton
-      AnchorSideTop.Side = asrCenter
-      AnchorSideRight.Control = ComputeBtn
-      AnchorSideBottom.Control = ParamsPanel
-      AnchorSideBottom.Side = asrBottom
-      Left = 63
-      Height = 25
-      Top = 344
-      Width = 54
-      Anchors = [akRight, akBottom]
-      AutoSize = True
-      Caption = 'Reset'
-      OnClick = ResetBtnClick
-      TabOrder = 4
-    end
-    object CloseBtn: TButton
-      AnchorSideLeft.Side = asrBottom
-      AnchorSideTop.Side = asrCenter
-      AnchorSideRight.Control = ParamsPanel
-      AnchorSideRight.Side = asrBottom
-      AnchorSideBottom.Control = ParamsPanel
-      AnchorSideBottom.Side = asrBottom
-      Left = 209
-      Height = 25
-      Top = 344
-      Width = 55
-      Anchors = [akRight, akBottom]
-      AutoSize = True
-      BorderSpacing.Left = 8
-      BorderSpacing.Top = 8
-      Caption = 'Close'
-      ModalResult = 1
-      OnClick = CloseBtnClick
-      TabOrder = 6
-    end
-    object ComputeBtn: TButton
-      AnchorSideRight.Control = CloseBtn
-      AnchorSideBottom.Control = ParamsPanel
-      AnchorSideBottom.Side = asrBottom
-      Left = 125
-      Height = 25
-      Top = 344
-      Width = 76
-      Anchors = [akRight, akBottom]
-      AutoSize = True
-      BorderSpacing.Left = 8
-      BorderSpacing.Top = 8
-      BorderSpacing.Right = 8
-      Caption = 'Compute'
-      OnClick = ComputeBtnClick
-      TabOrder = 5
-    end
-    object PlotOptionsGroup: TGroupBox
+    object PlotOptionsGroup: TGroupBox[7]
       AnchorSideLeft.Control = ParamsPanel
       AnchorSideTop.Side = asrBottom
       AnchorSideRight.Control = BinSelectionGroup
       AnchorSideRight.Side = asrBottom
-      AnchorSideBottom.Control = Bevel1
+      AnchorSideBottom.Control = ButtonBevel
       Left = 0
       Height = 52
       Top = 276
@@ -310,7 +258,7 @@ inherited FreqFrm: TFreqFrm
         TabOrder = 0
       end
     end
-    object BinSelectionGroup: TGroupBox
+    object BinSelectionGroup: TGroupBox[8]
       AnchorSideLeft.Control = ParamsPanel
       AnchorSideRight.Control = ParamsPanel
       AnchorSideRight.Side = asrBottom
@@ -372,12 +320,9 @@ inherited FreqFrm: TFreqFrm
       end
     end
   end
-  object ParamsSplitter: TSplitter[1]
+  inherited ParamsSplitter: TSplitter
     Left = 276
     Height = 385
-    Top = 0
-    Width = 5
-    ResizeStyle = rsPattern
   end
   object PageControl: TPageControl[2]
     Left = 285
diff --git a/applications/lazstats/source/forms/analysis/descriptive/frequnit.pas b/applications/lazstats/source/forms/analysis/descriptive/frequnit.pas
index 6f57cd031..3ef3b7aaa 100644
--- a/applications/lazstats/source/forms/analysis/descriptive/frequnit.pas
+++ b/applications/lazstats/source/forms/analysis/descriptive/frequnit.pas
@@ -10,25 +10,21 @@ uses  lazlogger,
   Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, LCLVersion,
   StdCtrls, Buttons, ExtCtrls, ComCtrls, Spin,
   Globals, MainUnit, DataProcs,
-  BasicStatsFormUnit, ReportFrameUnit, ChartFrameUnit;
+  BasicStatsReportFormUnit, ReportFrameUnit, ChartFrameUnit;
 
 type
 
   { TFreqFrm }
 
-  TFreqFrm = class(TBasicStatsForm)
-    Bevel1: TBevel;
+  TFreqFrm = class(TBasicStatsReportForm)
     BinSelectionGroup: TGroupBox;
     ThreeDChk: TCheckBox;
-    ComputeBtn: TButton;
     PlotOptionsGroup: TGroupBox;
     NoIntervalsLabel: TLabel;
     PageControl: TPageControl;
+    ReportPage: TTabSheet;
     Panel1: TPanel;
     Panel2: TPanel;
-    ParamsPanel: TPanel;
-    ResetBtn: TButton;
-    CloseBtn: TButton;
     NormPltChk: TCheckBox;
     InBtn: TBitBtn;
     OutBtn: TBitBtn;
@@ -36,8 +32,6 @@ type
     Label1: TLabel;
     Label2: TLabel;
     SelList: TListBox;
-    ParamsSplitter: TSplitter;
-    ReportPage: TTabSheet;
     NoIntervalsEdit: TSpinEdit;
     HorBarsBtn: TSpeedButton;
     LinePlotBtn: TSpeedButton;
@@ -45,32 +39,29 @@ type
     VertBarsBtn: TSpeedButton;
     VarList: TListBox;
     procedure AllBtnClick(Sender: TObject);
-    procedure CloseBtnClick(Sender: TObject);
-    procedure ComputeBtnClick(Sender: TObject);
-    procedure FormActivate(Sender: TObject);
-    procedure FormCreate(Sender: TObject);
     procedure InBtnClick(Sender: TObject);
     procedure OutBtnClick(Sender: TObject);
-    procedure ResetBtnClick(Sender: TObject);
-    procedure SelListSelectionChange(Sender: TObject; User: boolean);
+    procedure SelListSelectionChange(Sender: TObject; {%H-}User: boolean);
     procedure VarListDblClick(Sender: TObject);
-    procedure VarListSelectionChange(Sender: TObject; User: boolean);
+    procedure VarListSelectionChange(Sender: TObject; {%H-}User: boolean);
+
   private
-    { private declarations }
-    FReportFrame: TReportFrame;
-    FAutoSized: Boolean;
     procedure CalcIntervals(var AMin, AMax, AIntervalSize: Double;
       out ANumIntervals: Integer);
     procedure ClearTabs;
     function CreateOrGetChartFrame(AColIndex: Integer; AVarName: String): TChartFrame;
     function GetPageCaption(AVarName: String): String;
     procedure PlotFreq(AChartFrame: TChartFrame; AColIndex: Integer;
-      AVarName: String; const xLabels: StrDyneVec;
-      const Freq: DblDyneVec);
+      AVarName: String; const xLabels: StrDyneVec; const Freq: DblDyneVec);
     procedure PlotNormalDist(AChartFrame: TChartFrame; Freq: DblDyneVec);
-    procedure UpdateBtnStates;
+
+  protected
+    procedure AdjustConstraints; override;
+    procedure Compute; override;
+    procedure UpdateBtnStates; override;
+
   public
-    { public declarations }
+    constructor Create(AOwner: TComponent); override;
     procedure Reset; override;
   end; 
 
@@ -78,6 +69,7 @@ var
   FreqFrm: TFreqFrm;
 
 
+
 implementation
 
 {$R *.lfm}
@@ -86,8 +78,32 @@ uses
   Math, TAChartUtils, TALegend, TASources, TACustomSeries, TASeries,
   Utils, MathUnit;
 
+
 { TFreqFrm }
 
+constructor TFreqFrm.Create(AOwner: TComponent);
+begin
+  inherited;
+  FReportFrame.Parent := ReportPage;
+end;
+
+
+procedure TFreqFrm.AdjustConstraints;
+begin
+  Panel1.Constraints.MinHeight := AllBtn.Top + AllBtn.Height;
+  Panel1.Constraints.MinWidth := Max(Label1.Width, Label2.Width) + AllBtn.Width + VarList.BorderSpacing.Right*2;
+  ParamsPanel.Constraints.MinHeight := Panel1.Constraints.MinHeight +
+    NormPltChk.BorderSpacing.Top + NormPltChk.Height +
+    BinSelectionGroup.BorderSpacing.Top + BinSelectionGroup.Height +
+    PlotOptionsGroup.BorderSpacing.Top + PlotOptionsGroup.Height +
+    ButtonBevel.Height +
+    CloseBtn.BorderSpacing.Top + CloseBtn.Height;
+  ParamsPanel.Constraints.MinWidth := Max(
+    4*CloseBtn.Width + 3*CloseBtn.BorderSpacing.Left,
+    Panel1.Constraints.MinWidth) + ParamsPanel.BorderSpacing.left*2;
+end;
+
+
 procedure TFreqFrm.AllBtnClick(Sender: TObject);
 var
   count, index : integer;
@@ -119,23 +135,19 @@ begin
   ANumIntervals := round((AMax - AMin) / AIntervalSize);
 end;
 
+
 procedure TFreqFrm.ClearTabs;
 var
   i: Integer;
 begin
-  FReportFrame.Clear;
+  if Assigned(FReportFrame) then
+    FReportFrame.Clear;
   for i := PageControl.PageCount-1 downto 1 do
     PageControl.Pages[i].Free;
 end;
 
 
-procedure TFreqFrm.CloseBtnClick(Sender: TObject);
-begin
-  Close;
-end;
-
-
-procedure TFreqFrm.ComputeBtnClick(Sender: TObject);
+procedure TFreqFrm.Compute;
 var
   i, j, k: integer;
   freq: DblDyneVec = nil;
@@ -368,55 +380,6 @@ begin
 end;
 
 
-procedure TFreqFrm.FormActivate(Sender: TObject);
-var
-  w: Integer;
-begin
-  if FAutoSized then
-    exit;
-
-  w := MaxValue([ResetBtn.Width, ComputeBtn.Width, CloseBtn.Width]);
-  ResetBtn.Constraints.MinWidth := w;
-  ComputeBtn.Constraints.MinWidth := w;
-  CloseBtn.Constraints.MinWidth := w;
-
-  Panel1.Constraints.MinHeight := AllBtn.Top + AllBtn.Height;
-  Panel1.Constraints.MinWidth := Max(Label1.Width, Label2.Width) + AllBtn.Width + VarList.BorderSpacing.Right*2;
-  ParamsPanel.Constraints.MinHeight := Panel1.Constraints.MinHeight +
-    NormPltChk.BorderSpacing.Top + NormPltChk.Height +
-    BinSelectionGroup.BorderSpacing.Top + BinSelectionGroup.Height +
-    PlotOptionsGroup.BorderSpacing.Top + PlotOptionsGroup.Height +
-    Bevel1.Height +
-    CloseBtn.BorderSpacing.Top + CloseBtn.Height;
-  ParamsPanel.Constraints.MinWidth := Max(
-    3*w + 2 * CloseBtn.BorderSpacing.Left,
-    Panel1.Constraints.MinWidth) + ParamsPanel.BorderSpacing.left*2;
-
-  Constraints.MinWidth := ParamsPanel.Constraints.MinWidth + 300;
-  Constraints.MinHeight := ParamsPanel.Constraints.MinHeight + ParamsPanel.BorderSpacing.Top*2;
-  if Width < Constraints.MinWidth then Width := 1;     // trigger autoscaling
-  if Height < Constraints.MinHeight then Height := 1;
-
-  Position := poMainFormCenter;
-  FAutoSized := true;
-end;
-
-
-procedure TFreqFrm.FormCreate(Sender: TObject);
-begin
-  Assert(OS3MainFrm <> nil);
-
-  InitForm(Self);
-
-  FReportFrame := TReportFrame.Create(self);
-  FReportFrame.Parent := ReportPage;
-  FReportFrame.Align := alClient;
-
-  Position := poDefault;
-  Reset;
-end;
-
-
 function TFreqFrm.GetPageCaption(AVarName: String): String;
 begin
   Result := 'Plot of ' + AVarName;
@@ -448,6 +411,7 @@ begin
   UpdateBtnStates;
 end;
 
+
 procedure TFreqFrm.OutBtnClick(Sender: TObject);
 var
   i: integer;
@@ -467,6 +431,7 @@ begin
   UpdateBtnStates;
 end;
 
+
 procedure TFreqFrm.PlotFreq(AChartFrame: TChartFrame; AColIndex: Integer;
   AVarName: String; const xLabels: StrDyneVec; const Freq: DblDyneVec);
 var
@@ -591,6 +556,8 @@ procedure TFreqFrm.Reset;
 var
   i: integer;
 begin
+  inherited;
+	
   VarList.Clear;
   SelList.Clear;
   for i := 1 to NoVariables do
@@ -602,18 +569,14 @@ begin
 end;
 
 
-procedure TFreqFrm.ResetBtnClick(Sender: TObject);
-begin
-  Reset;
-end;
-
-
 procedure TFreqFrm.UpdateBtnStates;
 var
   lSelected: Boolean;
   i: Integer;
   chartFrame: TChartFrame;
 begin
+  inherited;
+	
   lSelected := false;
   for i := 0 to VarList.Items.Count-1 do
     if VarList.Selected[i] then
@@ -634,7 +597,6 @@ begin
 
   AllBtn.Enabled := VarList.Items.Count > 0;
 
-  FReportFrame.UpdateBtnStates;
   for i := 1 to PageControl.PageCount-1 do
   begin
     chartFrame := PageControl.Pages[i].Controls[0] as TChartFrame;
@@ -658,7 +620,6 @@ begin
 end;
 
 
-
 procedure TFreqFrm.VarListSelectionChange(Sender: TObject; User: boolean);
 begin
   UpdateBtnStates;
diff --git a/applications/lazstats/source/forms/analysis/descriptive/normalityunit.pas b/applications/lazstats/source/forms/analysis/descriptive/normalityunit.pas
index b18bd5e8d..eb730fddd 100644
--- a/applications/lazstats/source/forms/analysis/descriptive/normalityunit.pas
+++ b/applications/lazstats/source/forms/analysis/descriptive/normalityunit.pas
@@ -9,7 +9,7 @@ interface
 uses
   Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs,
   StdCtrls, Buttons, ExtCtrls, ComCtrls,
-  MainUnit, Globals, FunctionsLib, DataProcs, BasicStatsReportAndChartFormUnit, 
+  MainUnit, Globals, FunctionsLib, BasicStatsReportAndChartFormUnit,
   ReportFrameUnit, ChartFrameUnit;
 
 
@@ -57,7 +57,7 @@ uses
   Math, MathUnit,
   TAChartUtils, TATextElements, TACustomSeries, TATransformations,
   TAChartAxisUtils, TAChartAxis, TASources,
-  Utils;
+  Utils, GridProcs;
 
 
 function PopulateLeftMarks(AOwner: TComponent): TListChartSource;
@@ -379,18 +379,13 @@ var
   selCol: Integer;
   i, n: Integer;
 begin
+  Result := nil;
+
   // Find data column in the grid
-  selcol := 0;
-  for i := 1 to NoVariables do
-    if OS3MainFrm.DataGrid.Cells[i, 0] = VarName then
-    begin
-      selcol := i;
-      break;
-    end;
-  if selCol = 0 then
+  selCol := GetVariableIndex(OS3MainFrm.DataGrid, VarName);
+  if selCol <= 0 then
   begin
-    Result := nil;
-    MessageDlg('No variable selected.', mtError, [mbOK], 0);
+    ErrorMsg('No variable selected.');
     exit;
   end;
 
@@ -400,7 +395,7 @@ begin
   n := 0;
   for i := 1 to NoCases do
   begin
-    if not ValidValue(i, selcol) then
+    if not ValidValue(OS3MainFrm.DataGrid, i, selcol) then
       continue;
     inc(n);
     if not TryStrToFloat(OS3MainFrm.DataGrid.Cells[selcol, i], Result[n]) then