RichTextBox - Setting position to the end of Text

[Udi]

Hi,
I have derived my ConsoleTextBox from RichTextBox.
I'm trying to implement a console-like text box with history
capabilities.
My problem is that when I'm trying to append a command, I can't place
the cursor at the end of the text.

### See SetCmdLn() method: ####

protected override bool IsInputKey(Keys keyData)
{
int lineNo = GetLineFromChar Index(Selection Start);
switch (keyData)
{
case Keys.Enter:
{
:
}
case Keys.Up:
{ //user asks for previous history cmd
if (lineNo == Lines.Length - 1)
{
OnArrowUp();
return true;
}
break;
}
case Keys.Down:
{//user asks for next history cmd
:
}
:
}

return base.IsInputKey (keyData);
}
private void OnArrowUp()
{
// Point to previous history cmd while possible
:
SetCmdLn();
}

private void SetCmdLn()
{
string [] tmpTxtMatrix = new string [Lines.Length];
Lines.CopyTo(tm pTxtMatrix, 0);

//Replace last line in console with history value
tmpTxtMatrix[tmpTxtMatrix.Le ngth - 1] = history[historyIdx] as string;

//Clear();
Lines = tmpTxtMatrix;
//String.Join("\n ", tmpTxtMatrix);
//AppendText( String.Join("\n ", tmpTxtMatrix));
Select(Text.Len gth ,0); ######## THIS DOES NOT WORK !!! ########
}

It always sets the caret position BEFORE the last added line.
(As you can see in the commented out lines, I tried manipulating it but
it didn't help.)

My questions are:
1. How do I place the caret at the end of my new text?
2. What's the difference between Text and Lines?
3. Why doesn't the Text property change when I set Lines
with a new value?
4. And last but not least, is there a way to update only a speciffic
line in Lines (in my case its always the last line) without having
to copy all the Lines to a new array of strings?

Thanks a lot!
Udi.

[Udi]

What I meant in question 3 is why the Length of Text retrieves the
length without the length of the added line?
Thanks again!
Udi.