>WHEN ITRY TO INSERT AT THISFORM.TEXT1.VALUE VALUE AS WAHTEVR, NOT WORKS.
Can you post the code that you use to insert the text? A line such as
THISFORM.TEXT1.VALUE = "Some text"
should only fail if the textbox has an expression as a control source. In this case, the control source overwrites the modified value as soon as you refresh the control or set the focus to it.
