I was able to solve it. I imported two java classes.
import java.awt.Robot;
import java.awt.event.KeyEvent;
and wrote this
Robot r = new Robot();
r.keyPress(KeyEvent.VK_ENTER);
r.keyRelease(KeyEvent.VK_ENTER);
And now this is what i have in my code:
WebUI.sendKeys(findTestObject(‘Page_f’), Keys.chord(Keys.CONTROL, ‘s’))
WebUI.delay(2)
Robot r = new Robot();
r.keyPress(KeyEvent.VK_ENTER);
r.keyRelease(KeyEvent.VK_ENTER);
Java Robot class is able to interact with windows native dialog.