If you are trying to use this control in another project, and it is not displayed in your toolbox, right click in the toolbox under the General tab and select Choose Items from the context menu.
In the Choose Toolbox Items dialog box under the .Net Framework Components tab, click the Browse button. Browse for and located the TextBoxEx.dll in the Release folder on the CD for this project. Once you select the component and click the Open button, the component will be added to the list of components displayed in the .Net Framework Components list and will be checked.
Click OK in the Choose Toolbox Items dialog box to have this component added to the General tab of the Toolbox.
Now simply drag the component to a Windows form to start using it.