The previously shown openTabAction has an additional Boolean configuration
parameter singleton. In the example a button that opens a
coreMediaTab is added, which is a browse tab with the fix URL of the CoreMedia
homepage:
...
<editor:favoritesToolbar>
<plugins>
<ui:addItemsPlugin>
<ui:items>
<!-- Add a button that opens the CoreMedia homepage browse tab as singleton -->
<button itemId="coremediaTab">
<baseAction>
<editor:openTabAction singleton="true" text="...">
<editor:tab>
<example:coreMediaTab/>
</editor:tab>
</editor:openTabAction>
</baseAction>
</button>
</ui:items>
...
</ui:addItemsPlugin>
</plugins>
</editor:favoritesToolbar>
...Example 7.48. Adding a button to open a browser tab
In the work area there will be no more than one opened coreMediaTab: When
clicking the button the already opened coreMediaTab will be active instead of
opening a new one.
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