Disable query on initial load of form

[mmumford]

I have main form with mulitple sub-forms embedded on separate tabs within a tab control. Each sub-form accepts user-supplied values entered through text boxes. Each text box is provided a default value. Question: Is there any way to disable the queries on the initial load of the main form, and only execute the sub-form queries when requested by the user? The initial load of the main form is quite lengthy due to all of the sub-form queries.

Thanks in advance for any suggestions.