I am see an issue with the way the Editor component works inside a modal dialog. It seems that the resizing of the editor is wrong when in a dialog. I have attached a sample solution so you can see it for your self.
In the sample, you can see three different editors using pretty much the same MVC helper. One on the home page, one is in a Window component and one in a Dialog. All three have resizeable set to true.
The home page editor and the window editor resize consistently. The dialog editor resizes the component but not the text area of the component.
I need to use it in the dialog.