Kid 0 - XuiTextLine
"TextEvent" callback from every KeyDown
"Selection" callback from Enter KeyDown
XuiTextLine grids display a text string and accept user input text.
Pressing an Enter key while a XuiTextLine grid has keyboard focus generates a Selection callback message. Pressing an Enter key when the text cursor is anywhere in the line is equivalent - the Enter key is not inserted or appended to the text and the line is not broken into two parts.
