unit uMain;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, RzTabs, Menus;

type
  TFrmMain = class(TForm)
    RzPageControl1: TRzPageControl;
    MainMenu1: TMainMenu;
    N1: TMenuItem;
    N11: TMenuItem;
    N21: TMenuItem;
    N31: TMenuItem;
    TabSheet1: TRzTabSheet;
    procedure N11Click(Sender: TObject);
    procedure N21Click(Sender: TObject);
    procedure N31Click(Sender: TObject);
    procedure RzPageControl1Close(Sender: TObject; var AllowClose: Boolean);
  private
    { Private declarations }
  public
    procedure ShowDockForm(FormClass: TFormClass; dockCtrl: TRzPageControl );

  end;

var
  FrmMain: TFrmMain;

implementation

uses
  Unit1;

{$R *.dfm}
{ TForm12 }

procedure TFrmMain.N11Click(Sender: TObject);
begin
  ShowDockForm(TForm1,RzPageControl1);
end;

//procedure TFrmMain.N21Click(Sender: TObject);
//begin
//  ShowDockForm(TForm2,RzPageControl1);
//end;
//
//procedure TFrmMain.N31Click(Sender: TObject);
//begin
//  ShowDockForm(TForm3,RzPageControl1);
//end;

procedure TFrmMain.RzPageControl1Close(Sender: TObject;
  var AllowClose: Boolean);
begin
  AllowClose :=  RzPageControl1.ActivePageIndex >0;
end;

procedure TFrmMain.ShowDockForm(FormClass: TFormClass; dockCtrl: TRzPageControl);
  procedure ShowCaption(ParentCtrl: TWinControl; ACaption: string);
  begin
    if ParentCtrl is TRzTabSheet then
      TRzTabSheet(ParentCtrl).Caption := ACaption;
  end;

var
  i: Integer;
  TabCtrl: TRzTabSheet;
  Form: TForm;
begin
  Screen.Cursor := crHourGlass;
  try
    for i := 0 to Screen.CustomFormCount - 1 do
      if Screen.CustomForms[i] is FormClass then
      begin
        if (not(Screen.CustomForms[i]).Visible) then
          (Screen.CustomForms[i]).Visible := True;
        (Screen.CustomForms[i]).BringToFront;
        (Screen.CustomForms[i]).SetFocus;
        TabCtrl := TRzTabSheet(Screen.CustomForms[i].Parent);
        ShowCaption(TabCtrl, Screen.CustomForms[i].Caption);
        TRzPageControl(dockCtrl).ActivePageIndex := TabCtrl.PageIndex;
        exit;
      end;

    TabCtrl := TRzTabSheet.Create(dockCtrl); // dockCtrl
    TabCtrl.PageControl := TRzPageControl(dockCtrl);
    TRzPageControl(dockCtrl).ActivePageIndex := TabCtrl.PageIndex;

    Form := FormClass.Create(TabCtrl);
    with Form do
      try
        ManualDock(TabCtrl);
        ShowCaption(TabCtrl, Caption);

        Show;
        Form.WindowState := wsMaximized;
        Form.Align := alClient;
      except
        Free;
      end;

  finally
    Screen.Cursor := crDefault;
  end;
end;

end.