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Change style in dtmlxWindows

Hi,

I'm using the pro version and have a problem with the styles using dhtmlXWindows.
I can't use other styles except dhx_black, dhx_blue, dhx_skyblue. I need to use modern_blue style!
Here my code:
dhxWins = new dhtmlXWindows();
dhxWins.enableAutoViewport(false);
dhxWins.attachViewportTo("content0");
dhxWins.setImagePath("js/dhtmlxSuite/dhtmlxWindows/codebase/imgs/");
usersWindow = dhxWins.createWindow("newUserWindow", 20, 30, 500, 550);
usersWindow.setSkin("modern_blue");
usersWindow.setText("text");
usersWindow.center();
usersWindow.attachURL(url);


Can you help me?