Rest the value in MaskInput

hi,

I am using a MaskInput in Dialog, and would like to clear the value before the Dialog opens.

What I have done so far,

used setValue(null) and

cleared the value data binding value using, oModel.setProperty("/maskIpt", "");

When the element is rendered, it shows the place holder String, it means that the value of the MaskInput is cleared,

The problem

is when I start typing the previous value is displayed.

Is there a method to reset the input, to display the initial value with the placeholder characters (eg: ____-____) every time I open the dialog?

Thank you

Sudhir Kancherla