Changed the size of the window to look nicer.
Set textctrl1 to be readonly, multiline, not to wrap lines, and to auto scroll.
Set textctrl2 to be able to process enter commands.
Added an event handler to txtctrl2. Upon hitting enter, the text will be appended to txtctrl1 and txtctrl2 cleared.
Added an event handler to the button. Uppon click, it clears txtctrl1.