Pb using scroll wheel on SyntaxEditor in Single-Line mode with WordWrap

I use SyntaxEditor to edit a value in a PropertyGrid.
I have set the IsMultiLine property to false and the WordWrapMode to 'Word'.

Everything works fine except when the SyntaxEDitor content wraps on two lines.
If I then use scroll wheel down (or PageDown) on the SyntaxEditor, the content scrolls down one line and I only see the second line.
There is no way to scroll up to see the first line : scroll wheel up, key Up, Home ... (except sometimes by using PageUp keystroke)