I want to use inputmask in a combobox with inputmask '9-99-999-99999', and also want to restrict user to enter the data using same inputmask.

cb1.format = "ZKR"
cb1.inputmask= "9-99-999-99999"

What I get from setting these properties. When user enters the data it is OK. But the data in list is not changed by inputmask.

Now what I did to solve this problem I used transform() in the SELECT statement to show data in required inputmask.
It changed the data, but when user enters the data in combobox it shows the additional "-" due to "-" presence in data.
How would I acheive the solution?