Button markup id is missing on Modal Window

[Warren Bell <wa...@gmail.com>]

I have a Modal Window that acts like a progress indicator. It has an 
AbstractAjaxTimerBehavior that checks to see if a condition is met. When 
it is met an image on the Modal Window is removed and a form with an 
AjaxButton is added. The image starts with isVisible() = true and the 
form and button start with it set false. The image comes off fine, but 
the form and button never get added. The Ajax debugger error is:

ERROR: Component with id [[processingForm]] a was not found while trying 
to perform markup update. Make sure you called 
component.setOutputMarkupId(true) on the component whose markup you are 
trying to update.
ERROR: Component with id [[okButton]] a was not found while trying to 
perform markup update. Make sure you called 
component.setOutputMarkupId(true) on the component whose markup you are 
trying to update.

I am calling Component#setOutputMarkupId(true), 
Component#setMarkupId(String id) and 
Component#setOutputMarkupPlaceholderTag(true). If I start with 
everything visible and then remove all of them, it works fine. It looks 
like Component#setOutputMarkupPlaceholderTag(true) is not working.

What do I need to do to make this work?

Thanks,

Warren

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