suggestions and questions for my project

[abdul]

My project is for a water company that keeps track of all the customers and their bills. The user can edit the customer information (which is in a database), view/print the bill, view/print the company's state so far, and edit the rates of different water volumes. The bill is calculated according the the amount of water that the customer consumed so we have some limitation and rates for certain number of volumes.

I had some problems with this project before, and thanks to Chris and Beachbum for the help on printing the bills and helping with the algorithm

I am almost done the project except the main screen (which links to all the other sections of the program), and I'm also having some problems.

First problem is this:
->Run the program (you will be presented with the main screen maximized)
->go to some other section by clicking on one of the buttons. The other form will also be maximized
->now, resize the other form so that it's not maximized
->go the main menu by clicking on "Go to Main Menu" button

You'll get an error message saying that the form can't be resized while minimized or maximized because you try to resize the main screen when it's maximized.
Here is the code I'm using:

'we will now show the main screen and hide this one
    '....
    'if this form is maximized then we maximize the main screen
    If Me.WindowState = vbMaximized Then
        mainscreen.WindowState = vbMaximized
    Else
        'if not, then we just resize the main screen so it's is
        'of the same size as this form is
        mainscreen.Move Me.Left, Me.Top, Me.Width, _
            Me.Height
    End If
    'hide this form
    Me.Hide
    'show the main screen
    mainscreen.show

What else should I put in there so it works fine?

Second Problem:
When you view the bill, it shows you the amount of bill in dollars. It should format it to 2 decimal places but it does not do that for the bill less than $10. Here is line of code I'm using:

txtBill.Text = Format(mybill, "$####.##")

Also, if you get any "Subscripts Out of Range" error then please let me know.

Please also give me some suggestions on how should I create the main screen. Also does the background look good? Should I change it, and change it to what kind of backgorund? How about the layout and different colours used?