You can also use an AttributeModifier, which will give you the old value (as
I recall).
overriding the method onComponentTag(ComponentTag tag), will let you easily
put a new variable for your class etc... but you will need to use tag.get(),
and tag.put(tag.get("")+"..."). Looks somewhat messy when you start using
StringBuffers, unless your doing a lot of tag modifications might as well
use AttributeModifier.
In fact use, SimpleAttributeModifier:
component.add(new SimpleAttributeModifier("class", "my-css-class"));
More methods can be seen here:
https://cwiki.apache.org/WICKET/how-to-modify-an-attribute-on-a-html-tag.html
Matthew
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