Well for a start, to get your close button working, you can change the button's ID to
BtnCancel:
code:
<Control xsi:type="ButtonControl" Id="BtnCancel">
<Position Left="112" Top="25" Width="50"/>
<Caption>Close</Caption>
</Control>
As a handy hint for anyone developing interface windows, Plus! automatically closes a window when a button with ID
BtnCancel is clicked.
As for your other requests, I'd be happy to help you, but I'm not quite sure what you're after. Could you be a little more specific? (What do you mean by "tabs" and "textboxes"?)