Allows more than 30Kb of text
(even under broken Win9x)
and a very very very very very very very very long line to test wxHSCROLL style

First 10 characters should be in red
Next 10 characters should be in blue
Next 10 characters should be normal
And the next 10 characters should be green and italic
This text should be cyan on blue
And this should be in blue and the text you type should be in blue as well