Date Time Picker Problem !?

I created a form using the DateTimePicker Control to write in a field.

Then I removed the DateTimePicker Control.

When I publish the form to another computer where the DateTimePicker Control
is not installed, the form does not work.
message : con not open something is missing on this pc.

If I install the DateTimePicker Control on this pc the form is working
without
problems.

I want to sent this contact form to other people who does not have this
control.

In the fact I am not using the DateTimePicker Control but it must be
somewhere in the form, but I cannot find it.

If I put in the form another DTP Control in the list of the fields it is
shown as DTP2 but there is no DTP1. Also in the code there is nothing
concerning DTP.

Has someone an idea how to find and to remove this control.

Thanks for replies
E.Zenker