Textbox working like Maskedit

Hi

how can I to use Textbox work like Maskedit, I need put a textbox with ",",when user type It fill the textbox from right to Left.

Example

User type number 3

00,03 %

User Type number 4

00,34 %
User type number 7
03,47
user Type NUMBER 8
34,78

How can I do ?


Thank You In Advance :o

instead of writing lots of code why dont u use third party controls or masked edit itself...