Text format of whole number changes when clicked

Hello,

Let us suppose we have a format n2 and decimals set to 2.

Now If we have some whole number in the text field for example 90.00 it is shown as "90.00". But if we click into the field it is shown as "90". 

Actually the format changes from '##.00' to '##' when the numeric textbox is clicked. We tried to changed the 'format' and 'decimals' property but still if we have a whole number then all zeros after decimal point are cut when we click in the text field.

We need to keep these zeros after clicking, how could this be achieved

Thank you,

Regards