hi,
 I compiled the following code,

\setuplayout [leftmargin=4cm,
              backspace=5cm]

\define[3]\FancyEntry {
    \ifnum\structurelistrealpagenumber=\realpageno\relax SAME \else OTHER
\fi PAGE
    \blank[medium]
    \doifelse \rawstructurelistfirst \MyMark

      {\color[red] {#1 = \MyMark}}
      {\color[blue]{#1 = \MyMark}}
    \blank[medium]
}

\definelist[MyTopics][criterium=all]

\def\MyMark{}

\def\Topic%
  {\dosingleargument\doTopic}

\def\doTopic[#1]{%
  \def\MyMark{#1}%
  \writetolist[MyTopics]{#1}{}%
}

\setuplist[MyTopics]
          [pagenumber=no,
           alternative=command,
           command=\FancyEntry]

\setuptexttexts[margin][\vbox{\placelist[MyTopics]}][]

\starttext

\Topic[First]

First Topic

\page

\Topic[Second]

Second Topic

\stoptext

but I can not get the right pdf, please check the attachment!

context  version: 2013.01.08 01:19
LuaTeX, Version beta-0.74.0-2012122510

  Thanks!

BEST REGARDS
PengCZ


2013/1/9 Hans Hagen <pragma@wxs.nl>

> On 1/8/2013 11:26 PM, Thomas A. Schmitz wrote:
>
>  \define[3]\FancyEntry
>>   {\doifelse{#1}{\MyMark}%
>>      {\color[red]{#1 = \MyMark}\blank[medium]}
>>      {\color[blue]{#1 = \MyMark}\blank[medium]}
>> }
>>
>
> When you're back in teaching mode I'll tell you how to do it properly, so
> here's a quick hack:
>
> \define[3]\FancyEntry {
>     \ifnum\**structurelistrealpagenumber=\**realpageno\relax SAME \else
> OTHER \fi PAGE
>     \blank[medium]
>     \doifelse \rawstructurelistfirst \MyMark
>
>       {\color[red] {#1 = \MyMark}}
>       {\color[blue]{#1 = \MyMark}}
>     \blank[medium]
> }
>
> In your case you compare an unexpandable macro with a regular one so that
> will always be false.
>
> Last year the list macros became more flexible and more properties are
> available as either unexpandable or expandable macro
>
> Hans
>
> ------------------------------**------------------------------**-----
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>                                              | www.pragma-pod.nl
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