property Calc.ButtonFromPoint (X as OLE_XPOS_PIXELS, Y as OLE_YPOS_PIXELS) as String
Retrieves the button from the point.

TypeDescription
X as OLE_XPOS_PIXELS A single that specifies the current X location of the mouse pointer. The x values is always expressed in client coordinates
Y as OLE_YPOS_PIXELS A single that specifies the current X location of the mouse pointer. The x values is always expressed in client coordinates
String A string expression that indicates the name of the button over the point (x,y) excluding the HTML tags. 
Use the ButtonFromPoint property to get the button from cursor.

The following sample displays the button from cursor:

Private Sub Calc1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
    With Calc1
        Debug.Print .ButtonFromPoint(X / Screen.TwipsPerPixelX, Y / Screen.TwipsPerPixelY)
    End With
End Sub