Open Editor on Eclipse RCP

see that samples.
http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-text-home/development/rcp/examples/index.html

that's difficult.
even in open text files,i should create some classes.
and now I'dont know how to use other editor plugin.
when i open file.
it coused that error
org.eclipse.ui.PartInitException: Text editor does not have a document provider

maybe on 3.1,that become more easy.

give up handle moving view.

on Eclipse 3.01 Windows XP

I don't know how to handle movable views,and
I give up using them.

I choose 2 rules.
Rule 1.Never use folder.
Rule 2.Use setFixed(true) when use setEditorAreaVisible(false)

why folder is movable.
and folder can't back window.

when use setEditorAreaVisible(false) and all views go out,
view didn't come back alone.
maybe everyuser panic that.