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 I have dropdown list cextcombobox ,when drop down and mouse moves the combobox’s text changed,

but no  ON_CBN_SELCHANGE notify fires. How to know the change in our application

We have coded a sample application for you. It is a very simple application which has list box and combo box windows on the main dialog window implemented in the CTestDlg class. The main dialog handles the CBN_*** notification messages from the CComboBox m_wndCB window. You can see exactly when CBN_SELCHANGE message is really sent by the combo box window. You can change the type of the m_wndCB from CComboBox to CExtComboBox and you will see no differences in the message notifications.

Finally, we think you need to use the CBN_SELENDOK notification message instead of CBN_SELCHANGE. The CBN_SELENDOK message guarantees you that the combo box selection is performed by the user.

Thanks for your surpport,

But,Perhaps i did not say clearly,

I means I Use CExtComboBox and When DropDown and the When the Mouse Moves and the text of the ComboBox changes,and

there is no notification. How do i know the changes of the combotext when mouse move.

Thanks again

Yes, we confirm that there is a small difference between CExtComboBox and CComboBox classes. The CExtComboBox class really draws the selection in the main combo box area next to the drop-down button. In fact, it is just a visual effect because the selection is not changed.