need to be aware of are:
- wrapping things in webmarkupcontainers to modify visibility
we now have a method on Component:
/**
* Render a placeholder tag when the component is not visible. The tag
is of
* form: <componenttag style="display:none;" id="componentid"/>.
This
* method will also call <code>setOutputMarkupId(true)</code>.
*
* This is useful, for example, in ajax situations where the component
* starts out invisible and then becomes visible through an ajax update.
* With a placeholder tag already in the markup you do not need to
repaint
* this component's parent, instead you can repaint the component
directly.
*
* When this method is called with parameter <code>false</code> the
* outputmarkupid flag is not reverted to false.
*
* @param outputTag
* @return this for chaining
*/
public final Component setOutputMarkupPlaceholderTag(final boolean
outputTag)
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