The Change event notifies your application when the control's caption is changed. Use the Caption property to access the control's caption. Use the Execute method to execute a command. The KeyDown event occurs when the user presses a key while an object has the focus. By default, the Caption property replaces the control's stack ( operators and operations ) with giving caption. If the new caption just change the format of the Caption property ( includes just HTML tags ), the new format is applied to the control's label and control's stack ( operators and operations ) is not altered. For instance, let's say that the control's label displays the number 78, and during the Change event your application change the Caption property to "<sha ;;0><b>" + Caption. In this case, the content of the Caption is not change, instead just the new HTML format is applied to the control's label, so operations on the calculator can continue.

The following sample displays the control's caption as soon as user types characters in the control:

Private Sub CalcCombo1_Change()
    With CalcCombo1
        Debug.Print .Caption
    End With
End Sub