Here you can see the palette, i.e., bottom right of this screenshot:
Below I show you two examples. First, I drag the "Label" item from the palette into the HTML editor:
Then, when I open the matching Java file, I see that a label with a matching ID has been added to the constructor:
Next, I drag the "DropDown List" item into the HTML editor, with this result:
As a result, on the Java side, the following lines have magically been added:
I'm now working on the AJAX autocomplete textfield (which will use this code). To this end, I've exposed the Wicket Extensions JAR to the Library Manager, via the plugin, so that the related AJAX class from that JAR can be used.
If anyone would like specific Wicket components to be prioritized, please let me know. Otherwise, I'll add whatever Wicket components I happen to like to the palette. What you see above is already part of the "nb_67" branch of the Wicket plugin and will be available as part of the next binary distribution.