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      <DIV id=3Dcontentdiv><!-- Article Starts -->
      <UL class=3Ddownload>
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/WTL4MFC4/WTL4MFC4_demo.zip">Downlo=
ad=20
        demo project - 48 KB</A> </LI></UL><!-- Add the rest of your =
HTML here -->
      <H2>Contents</H2>
      <UL>
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#intro">Introduction</=
A>=20

        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#refresher">Refresher =

        on ATL Dialogs</A>=20
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#ccwrappers">Common=20
        Control Wrappers</A>=20
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#appwizard">Creating =
a=20
        Dialog-Based App with the AppWizard</A>=20
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#usingwrap">Using the =

        Control Wrapper Classes</A>=20
        <UL>
          <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#atl1">ATL Way=20
          1 - Attaching a CWindow</A>=20
          <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#atl2">ATL Way=20
          2 - CContainedWindow</A>=20
          <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#atl3">ATL Way=20
          3 - Subclassing</A>=20
          <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#wtlway">The=20
          WTL Way - DDX</A> </LI></UL>
        <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#moreddx">More=20
        on DDX</A>=20
        <UL>
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#ddxmacros">DDX=20
          macros</A>=20
          <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#moreddx">More=20
          about DoDataExchange()</A>=20
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#usingddx">Using=20
          DDX</A> </LI></UL>
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#handlenotify">Handlin=
g=20
        Notifications from Controls</A>=20
        <UL>
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#handleinparent">Handi=
ng=20
          notifications in the parent</A>=20
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#reflnotify">Reflectin=
g=20
          Notifications</A>=20
          <UL>
            <LI><A=20
            =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#wtlreflmacros">WTL=20
            macros for handling reflected messages</A> =
</LI></UL></LI></UL>
        <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#oddsends">Odds=20
        &amp; Ends</A>=20
        <UL>
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#dlgfonts">Dialog=20
          Fonts</A>=20
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#atlmincrt">_ATL_MIN_C=
RT</A>=20
          </LI></UL>
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#revisionhistory">Revi=
sion=20
        History</A> </LI></UL>
      <H2><A name=3Dintro></A>Introduction to Part IV</H2>
      <P>Dialogs and controls are one area where MFC really saves you =
time and=20
      effort. Without MFC's control classes, you'd be stuck filling in =
structs=20
      and writing tons of <CODE>SendMessage</CODE> calls to manage =
controls. MFC=20
      also provides dialog data exchange (DDX), which transfers data =
between=20
      controls and variables. WTL supports all those features as well, =
and adds=20
      some more improvements in its common control wrappers. In this =
article=20
      we'll look at a dialog-based app that demonstrates the MFC =
features that=20
      you're used to, as well as some more WTL message-handling =
enhancements.=20
      Advanced UI features and new controls in WTL will be covered in =
Part=20
V.</P>
      <H2><A name=3Drefresher></A>Refresher on ATL Dialogs</H2>
      <P>Recall from <A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc1.asp">Part=20
      I</A> that ATL has two dialog classes, <CODE>CDialogImpl</CODE> =
and=20
      <CODE>CAxDialogImpl</CODE>. <CODE>CAxDialogImpl</CODE> is used for =
dialogs=20
      that host ActiveX controls. We won't cover ActiveX controls in =
this=20
      article, so the sample code uses <CODE>CDialogImpl</CODE>.</P>
      <P>To create a new dialog class, you do three things:</P>
      <OL>
        <LI>Create the dialog resource=20
        <LI>Write a new class derived from <CODE>CDialogImpl</CODE>=20
        <LI>Create a public member variable called <CODE>IDD</CODE>, and =
set it=20
        to the dialog's resource ID. </LI></OL>
      <P>Then you can add message handlers just like in a frame window. =
WTL=20
      doesn't change that process, but it does add other features that =
you can=20
      use in dialogs.</P>
      <H2><A name=3Dccwrappers></A>Control Wrapper Classes</H2>
      <P>WTL has lots of control wrappers which should be familiar to =
you=20
      because the WTL classes are usually named the same (or almost the =
same) as=20
      their MFC counterparts. The methods are usually named the same as =
well, so=20