Rather than looking for another X++ statement, you should identify why it's so slow. For example, you may have a problem with indexes of your table.
It's not true that "MS does not run open beta programs on AX". On the contrary, it's going to be released very soon.
Public beta versions are usually released relatively late, so people can work with something relatively stable and resembling…
It seems I've got this working now.
Changes I've made:
in the SysLookupMultiSelectCtrl class on the init method, I've added an inline method:
boolean isOnGrid(FormStringControl _ctrl)
If you don't have a proper development environment, trying to develop/debug something surely will be unnecessarily difficult...
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