I can't modify a MaskedTextBox control in binding.

I do not succeed to modify the content of a MaskedTextBox control
whose Property "OutputText" is in binding with field of type text of
one table in database a MDB. The control has been generated making a
drag-and-drop of the respective field from the window of the "Data Sources"
of the plan and associating to same a control of the
MaskedTextBox type to whose property "Mask" has been assigned the
following string "00.00.00" (to represent a time).
Only if i not set this property, I can to modify of the value, but
in this way I do not formatting automatic input of
the customer. From the same control, I want to be able to visualize
the value of the field and to only modify of the value (in sure
conditions).

The development environment is Visual Basic .Net Express with Framework
2,0 Beta.

Councils are accepted,

Thanks, dumbo.