App Gtk and Kdm Choose
 

I use a app made of Ubuntu system and a correct way I know to run it is installing Dropline or Gnome Slackbuild. But I am looking for a better way to avoid all this charge. I am using slack 14_64 release an kde 4.8. Then, what's the procedure to install this app unless all gnome install? How can I check lib associassion to run this gtk programm in kde form?

You would need to install all dependencies for the program you want to run. Seeing as how you don't provide any pertinent information (for example, the name of the actual program or a link to it) you aren't likely to get a very useful response.

It is a program to open and close X in order to control a Cybercafe. I used to install Gnome Slackbuild packages on slack 13.37 or 13.1 to get gtk libs. Xosd-bin, scrot and qiv are requirements too.

Are there debug commands to know what's important to install instead of complete Gnome?

It's a Brazilian page!

http://www.portalcriativa.com.br/produtos.php

Unless it isn't in README or some other documentation, ldd could help. If you have binary (eg. from ubuntu package) ldd will print it's shared libraries dependencies.
Compare this listing with available libraries (Slackware core, SlackBuilds or grab sources), get all dependencies and try rebuild it on Slackware.