The user have to fill value in textbox and click proceed button. On clicking the button, the text box should change to non-editable mode and also it show the value entered by user. How to do this?
Some widgets will carry a Enabled property so if the widget has that, you can use that, else you can use Visible / Invisible between the TextBox and a ValueDisplay
use a Mashup parameter to display the value entered in the TextBox in the ValueDisplay actually you can even directly bind the TextBox output to the ValueDisplay.
There should not be any reason this can't be done either approach, so perhaps you are not actually firing the event properly? or it isn't evaluating the way you expect it to.