The EditChange event is fired when user alters the text of the control's edit box. The PropertyChange event is fired when user changes the property's value. Use the Value property to access the old value for the property being changed. Use the ID property to identify a property. The KeyDown event is fired when user presses a key. The KeyPress event occurs when the user presses and releases an ANSI key. The control fires the SelChange event when a new property is selected. Use the UserData property to associate an extra data to a property. 

The following sample prints the current text of the control's editing box:

Private Sub PropertiesList1_EditChange(ByVal Property As EXPROPERTIESLISTLibCtl.IProperty, Value As Variant)
    Debug.Print Value
End Sub