Can i use GWT Designer in a subclass of Panel?

[eivenchan]

Hi ,
I have a class extends the Panel class, and i want to design it in GWT Designer.
But when i click the "Design" button, it shows a dialog:

Designer was unable to find any GUI elements in your source.
Check that the open complilation is a GUI class.

Does GWT Designer support this?

[Eric Clayberg]

I have a class extends the Panel class, and i want to design it in GWT Designer. But when i click the "Design" button, it shows a dialog:
...
Does GWT Designer support this?

Panel should not be subclassed. If you want to create a custom widget/panel, you should subclass Composite as stated in Google GWT docs.

GWT Designer can be used to edit Composites, EntryPoints, DialogBoxes and PopupPanels. It can't be used to edit Panel subclasses. This is intentional.

If you modify your class to be a Composite subclass (containing an Panel), you should be able to edit it using GWT Designer.