Fix textbox bgcolor.

README.md

@@ -1355,7 +1355,7 @@ def tickcb(f, c):
 ```python
 from gui.widgets.dial import Dial, Pointer
 ```
-![Image](./images/dial.JPG)
+![Image](./images/dial.JPG)  ![Image](./images/dial1.JPG)
 
 A `Dial` is a passive widget. It presents a circular display capable of
 displaying an arbitrary number of vectors; each vector is represented by a

gui/demos/tbox.py

@@ -58,7 +58,7 @@ pargs = (2, 2, 124, 7)  # Row, Col, Width, nlines
 # Keyword
 tbargs = {'fgcolor' : YELLOW,
         'bdcolor' : RED,
-        'bgcolor' : DARKGREEN,
+        'bgcolor' : BLACK,
         }
 
 

gui/widgets/textbox.py

@@ -92,7 +92,7 @@ class Textbox(LinearIO):
         wri.setcolor()  # Restore defaults
 
     def show(self):
-        if super().show():
+        if super().show(False):
             self._print_lines()
 
     def append(self, s, ntrim=None, line=None):