customizing WP template with Dreamweaver

I’m trying to customize a WP template with Dreamweaver (DW).

I’ve installed XAMPP pack, that include MySQL and Apache server. WP is installed to.

I’ve created a MySQL DB and user. I’ve set up a new site in DW, I’ve defined a connection to the DB just created.

What happen is that the very first time I open index.php in Dreamweaver and I use the Live View and Live Code options everything is working fine.

But this can be done only the firt time. If I close the page and I reopen, live mode do not work any longer, and furthermore I can not see the WP template in the browser: https://localhost/wordpress display a blank page.

Can anyone help me?