Customizing multi-tab dialog to show only one tab doesn't work

[Damian]

Take the Find dialog as an example. Customize it by hiding the Replace tab and leaving only the Replace tab visible:

replaceTab.hidden=true;
dialogDefinition.dialog.parts.dialog.addClass('cke_single_page'); 

This results in a single Find tab appearing in the dialog, but the tab can be accessed with keyboard and when navigating using arrows, an error occurs and the content of the dialog becomes blank.

[Damian]

I neglected to mention that I do not want to completely remove the Replace tab, i.e.

dialogDefinition.removeContents('replace');