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C# asp.net Maintain tab index after asynchronous postback ontextchanged

Ok, so I've researched this to the end of the earth and can't seem to find a solution that works.
I have a C# application, which is basically a web form made up of radio button lists and text boxes in an update panel. The form has multiple 'sections', each of which the user submits when completed. Each control performs a postback. This is because if the user modifies a section after completing it, the 'section saved' label needs to disappear.
This all works well, except the postbacks lose the tab order of the controls. I have found code examples that save the last control that had focus, which works well for the radio button lists, but because the text boxes post back when a user tabs to the next control (not modifies the text), it doesn't select the next control. The user has to hit tab again and it jumps to the third text box, not the second because technically, the second text box is what had focus after the initial postback. I hope this makes sense.
Any ideas? I can post code if required.
I should probably also add that this page is within a frame of our community portal.

Linking two forms in ASP.NET

I have an HTML form that handles some basic information. When the button for completing the form is clicked, I have a popup asking for additional information that appears (this is a div that is hidden until button click event). What I want to know is if there is a way to link those two forms together so that a final submit will POST all data on both forms?
Ideas I've Considered:
On button click, pass the 11 fields from form one into 11 hidden fields from form 2.
On final submit, create my own post call via javascript.
Both of these would work, but seem sort of hacky to me. I'd rather have a true method of linking two form submits if there is one. Anyone?

Why not just make the first button a NON ASP.NET button (i.e. just a regular HTML button)... with an onclick event which shows the hidden div. The Submit button on the hidden div would be the ASP.NET button which submits the entire form (data from both parts) to your ASPX?

Chrome Breaks Form by Persisting Drop Down List Selection on Back Button

Page A has a dropdownlist of shipping methods.
User makes a selection and clicks next.
Page B allows them to change their shipping address, which changes their shipping methods.
User clicks back button.
Page A shows new shipping methods in drop down, but Chrome has added a blank option at the top and made it the selected option. This blank option DOES NOT EXIST in the view source.
Chrome is choosing to insert a phantom blank selection item when its persisted drop down list value no longer exists, rather than respecting the selected="selected" tagged option.
This causes .net event validation to fail whenever the user tries to interact with the form, because this blank selection isn't real. "Invalid postback or callback argument. Event validation is enabled"
I've tried form.reset() on page load, and turning autocomplete off on the form tag. Anyone have any ideas? Much appreciated.

tab container selected - all things are disappear

I am using a ASP.Net and AJAX web which contain
TabContainer
gridView(grid view generated in run time and make 1 of
the column as the tab page header)
combobox
2 textbox(date fr/to)
button
Problem is.. after the data was retrieved.. everything look find. now i want to fire the tab container event.. autopostback set to true.. once user selected the tabs.. all the things from the page are disappear..(actually i test for other component which is set the autopost to true.. it will make some effect) its seem to be reload without pulling back the existing movement.. what can i do to enhance it? is it anything related to my coding? or setting? or concept was wrong already?
before tab click
after tab is selected

passing data from Ajax Modal popup extender to a textbox on the asp.net page

I have a Ajax modal popup that displays a set of options for the user. On submit button click event on the ajax modal popup, i need to pass the user selected data back to a text box on the user control (which has the modal pop up) on the calling page.
Structure/flow is as follows. There is a page and two user controls. One is a search control that has another user control that contains the user options. The master page has the search user control. When the user chooses an option in a dropdownlist in the search control, it does a mpe.Show of the user control with options. User makes his selections and hit submit button. In the button click event in the popup, i delegate an event back to the search user control which tries to set the value in one of its text boxes. Everything is going fine until this step and i can see the value but the text box never changes. It seems like the user control is already rendered and the changes are ignored. Any idea how I can get around this?
In short, how to get back the data to a control from an Ajax modal popup.

Use jquery - when the user clicks a button on the modal - use jquery to set the value field to be the data that the user has selected.
e.g.
$('#modalButton').click(function() {
var userData = $('#tbUserData').val();
$('#textBoxElsewhere').val(userData);
});

for anybody's future reference, i did a work around for this. What was happening is that, on the final button click postback, the page/parent user control load events run first and then the button click event.. so the changes that were being made in the button click event did not make it back to the parent user control on the page.. i had to add a middle step to display the user selections for approval and force the user to hit a final confirmation hit. On that post back, the changes were already available for the parent user control, and not have to wait for the button click event to trigger to grab the data. I'm sure there is a better way to do this but this is what I could come up with.