How to show a Print Preview window as MDI child of Top-Level form

MORE INFORMATION

1. Run the following code from a program (.prg) file:

         CLEAR ALL
         PUBLIC oform
         LOCAL lnI
         CLOSE DATA ALL
         Delete file table_1.dbf
         CREATE TABLE table_1 (field1 C(10))
         FOR lnI = 1 TO 3
            INSERT INTO table_1 VALUES ('xx')
         ENDFOR
         Delete file report_1.fr?
         CREATE REPORT report_1 FROM table_1
   
         oform=CREATEOBJECT("TL_form")
         oform.SHOW()
         READ EVENTS
         CLOSE TABLES
   
         DEFINE CLASS TL_form AS FORM
            BorderStyle = 3
            ShowWindow = 2
            AutoCenter = .T.
            lIsFormUp=.F.
            Width = 500
   
            ADD OBJECT commandpreview AS COMMANDBUTTON WITH ;
               TOP = 180, ;
               LEFT = 210, ;
               HEIGHT = 27, ;
               WIDTH = 95, ;
               CAPTION = "Report Preview", ;
               NAME = "Commandpreview"
   
            PROCEDURE DESTROY
               Clear EVENTS
               _SCREEN.VISIBLE=.T.
               SET SYSMENU TO DEFAULT
            ENDPROC
   
            PROCEDURE ACTIVATE
               IF !THIS.lIsFormUp
                  _SCREEN.VISIBLE = .f.   && We wait till now to hide desktop
                                    && to ensure SDI form is active window.
                  this.lIsFormUp = .T.
               ENDIF
            ENDPROC
   
            ADD object chkType as checkbox with ;
               top = 20, ;
               caption = 'Check to preview in window sized to form, ' ;
               + 'uncheck to maximize in top level form', ;
               autosize = .t., ;
               value = .T., ;
               backstyle = 0, ;
               left = 30
   
   
            PROCEDURE commandpreview.CLICK
               LOCAL foTemplate, llClosable
               * Create template form
               foTemplate = newobj('form')
               foTemplate.Name = SYS(2015)
               foTemplate.Caption = "My Report Preview Window"
               foTemplate.mdiform = .T.
               foTemplate.top = 0
               foTemplate.left = 0
               * Size template form to top level form
               foTemplate.width = thisform.width - 8  && 8 is fudge for border
               foTemplate.height = thisform.height ;
                  - 8 - sysmetric(9) && sysmetric is for TitleBar height
               IF !thisform.chkType.value
                  KEYB '{ctrl+f10}'  && Maximize the Preview Window
               ENDIF
               llClosable = thisform.closable
               thisform.closable = .f.  && Make main form not closable
               REPORT FORM report_1 PREVIEW WINDOW (foTemplate.name)
               thisform.closable = llClosable   && Restore original setting
            ENDPROC
   
            PROC Init
               DO do_menu WITH THIS,.T.,.T.
            ENDPROC
   
         ENDDEFINE
   
         PROC do_menu  && This is stripped down code from Menu Designer menu
            LPARAMETERS oFormRef, getMenuName, lUniquePopups
            LOCAL cMenuName, a_menupops
   
            m.cMenuName = SYS(2015)
   
            DIMENSION a_menupops[1]
            a_menupops[1]="_mfile"
   
            DEFINE MENU (m.cMenuName) IN (m.oFormRef.Name) BAR
            DEFINE PAD _msm_file OF (m.cMenuName) PROMPT "\<File"
            ON PAD _msm_file OF (m.cMenuName) ACTIVATE POPUP (a_menupops[1])
            DEFINE POPUP (a_menupops[1]) MARGIN RELATIVE SHADOW COLOR SCHEME 4
            DEFINE BAR 1 OF (a_menupops[1]) PROMPT "C\<lose" ;
               SKIP FOR WEXIST("My Report Preview Window")
            ON SELECTION BAR 1 of (a_menupops[1]) _screen.activeform.release()
            Activate MENU (m.cMenuName) NOWAIT
         ENDPROC
   						

2. Click Report Preview. Note that the preview may be maximized or minimized within the top-level form. The state of the check box determines whether the preview initially displays maximized or as a child window. When maximized, the preview resizes when the top-level form is resized. Otherwise, the preview can be sized independent of the top-level form.