ZK Developer's Guide

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Chapter 6
It's good to externalize the stylesheets into a file. With this mechanism it's possible to
reuse the styles across pages. The disadvantage is that we have to specify the sclass
attribute every time we want to use it. A more comfortable way is to define our own
component, and use it.
To use an extended component in the whole application, we have to define a
language-addon. A language-addon allows the usage of a component in the whole
application. Such an addon contains a set of components. First we have to provide a
file that defines the addons. An example is as follows.
my-addon
xul/html
specialLabel
label
sclass
simplelabel