Protected Overridable Sub OnIsDropDownOpenChanged( _
   ByVal oldValue As Boolean, _
   ByVal newValue As Boolean _
) 

Dim instance As UXDateTimePicker
Dim oldValue As Boolean
Dim newValue As Boolean
 
instance.OnIsDropDownOpenChanged(oldValue, newValue)

protected virtual void OnIsDropDownOpenChanged( 
   bool oldValue,
   bool newValue
)

protected procedure OnIsDropDownOpenChanged( 
    oldValue: Boolean;
    newValue: Boolean
); virtual; 

protected function OnIsDropDownOpenChanged( 
   oldValue : boolean,
   newValue : boolean
);

protected: virtual void OnIsDropDownOpenChanged( 
   bool oldValue,
   bool newValue
) 

protected:
virtual void OnIsDropDownOpenChanged( 
   bool oldValue,
   bool newValue
)