--- a/org.symbian.tools.wrttools.debug.core/src/org/symbian/tools/wrttools/debug/ui/DebugPreferencePage.java	Wed Jul 14 16:31:49 2010 -0700
+++ b/org.symbian.tools.wrttools.debug.core/src/org/symbian/tools/wrttools/debug/ui/DebugPreferencePage.java	Thu Jul 15 10:08:51 2010 -0700
@@ -18,15 +18,19 @@
  *******************************************************************************/
 package org.symbian.tools.wrttools.debug.ui;
 
+import java.io.File;
+
 import org.eclipse.jface.dialogs.MessageDialogWithToggle;
 import org.eclipse.jface.preference.DirectoryFieldEditor;
 import org.eclipse.jface.preference.FieldEditorPreferencePage;
+import org.eclipse.jface.preference.StringFieldEditor;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPreferencePage;
 import org.symbian.tools.wrttools.debug.internal.Activator;
+import org.symbian.tools.wrttools.debug.internal.ChromeDebugUtils;
 import org.symbian.tools.wrttools.debug.internal.IConstants;
 
 public class DebugPreferencePage extends FieldEditorPreferencePage implements
@@ -42,8 +46,22 @@
 
 	@Override
 	protected void createFieldEditors() {
-		DirectoryFieldEditor editor = new DirectoryFieldEditor("chrome", "Chrome Install Location:", getFieldEditorParent());
-		editor.setPreferenceName(IConstants.PREF_NAME_CHROME_LOCATION);
+        DirectoryFieldEditor editor = new DirectoryFieldEditor(IConstants.PREF_NAME_CHROME_LOCATION,
+                "Chrome Install Location:",
+                getFieldEditorParent()) {
+            @Override
+            protected boolean doCheckState() {
+                if (super.doCheckState()) {
+                    String message = validate(getStringValue());
+                    setErrorMessage(message);
+                    return message == null;
+                } else {
+                    return false;
+                }
+            }
+        };
+        editor.setValidateStrategy(StringFieldEditor.VALIDATE_ON_KEY_STROKE);
+        editor.setEmptyStringAllowed(false);
 		addField(editor);
 
         check = new Button(getFieldEditorParent(), SWT.CHECK);
@@ -54,6 +72,19 @@
                 IConstants.PREF_SHOW_RESOURCE_CHANGE_ERROR)));
 	}
 
+
+    protected String validate(String newValue) {
+        String error = null;
+        if (newValue == null || newValue.trim().length() == 0) {
+            error = "Chrome install location is not specified";
+        } else if (!new File(newValue).exists()) {
+            error = String.format("%s does not exist", newValue);
+        } else if (ChromeDebugUtils.getExecutablePath(newValue) == null) {
+            error = String.format("%s does not contain Chrome executable", newValue);
+        }
+        return error;
+    }
+
     @Override
     protected void performDefaults() {
         super.performDefaults();