Inspect in�� playground ("inspect it" from menu or with the play-icon):

|t|
t:=TextModel new.
t title:'Test'.
t openWithSpec

It opens a window with the textfield and an inspector.

In the inspector, choose the "preview" tab, your textfield window
will dissapear from the world and only show up in the preview tab.

Funny!
But is there any way to get the window back to the world?