Anyone know how to color specefic words in a text box?

[Mythril]

I wan't to be able to color things like follows:

Private Sub Command1_Click()
Dim I As Integer
For I = 1 To 90
TextBox1.BackColor = RGB(Red As Integer, Green As Integer, Blue As Integer)
Next I
End Sub

Except where i chose wich words are wich colors... could someone give me an example of this?