How i can change the custom dialog
classic themes to something else.
Take a look at this other answer where I walk through the things you need to do to create a custom warning dialog and insert it in a custom UI sequence.
While installing our setup we have
plan to show the some images like
slide show. Is it possible to show the
images like that in the Wix. Whether I
have to create any custom trigger to
show the images
This is what the BillBoardAction and BillBoard elements are for. To display bitmaps during the installation of files, I think you would put something like this in the UI sequence definition (I haven't tested it):
<BillboardAction Id="InstallFiles">
<Billboard Id="FirstBillboard" Feature="FeatureA">
<Control Id="FirstBitmap" Type="Bitmap"
Height="300" Width="300" X="0" Y="0">
<Binary Id="HelloWorld.bmp" SourceFile="setupImages\HelloWorld.bmp"/>
</Control>
</Billboard>
<Billboard Id="SecondBillboard" Feature="FeatureB">
<Control Id="SecondBitmap" Type="Bitmap"
Height="300" Width="300" X="0" Y="0">
<Binary Id="HelloAgain.bmp" SourceFile="setupImages\HelloAgain.bmp"/>
</Control>
</Billboard>
</BillboardAction>