VS 2008 Mimicking A Dialog Form Using A Panel?

I'm developing an application that should run on a 'kind of' mobile device. It's not exactly a mobile device (hence I'm not developing in the mobile framework, just winforms), but I can't use various Forms either.

Right now I am working on a proof of concept, and I simulated the mobile device simply with a UserControl that has a fixed size. Everything needs to happen on that UserControl, and I cannot display any other forms.

However, I now need a 'Dialog Form' to let the user enter some data (mainly text but it doesn't really matter). What I'm doing now is simply showing a Panel with a TextBox, OK button and Cancel button. I bring that panel to the front, hiding the rest of the application, when required. The different Panels (there's also one for a CheckBox, ComboBox, and the main application is also on a Panel) are all on a 'PanelContainer' UserControl I made, and I can switch panels simply by specifying their 'key' (a string such as "TEXT", "CHECK", "COMBO" etc). So I can display the textbox panel by simply doing

panelContainer1.SelectedKey = "TEXT" That brings the textbox panel to the front.

What I want now is that I can 'show' the panel as if it were a Dialog form. That means that the code 'waits' until the user has entered his text and either clicked OK or Cancel. Then I could use it like this

' Show the panel here
Dim result As DialogResult = panelContainer1.Panels("TEXT").ShowDialog()
' and immediately use the result (the code won't come here until the user has selected ok or cancel)

[Code]....